Upgrading to 512GB SSD on Asus Zenbook UX31A (update: UX31E too)

In June 2012 I have bought Asus Zenbook UX31A (model UX31A-R4003X). It has ADATA XM11 256GB SSD in similar form type as M.2 – Be careful disk inside UX31A is NOT M.2, they are not compatible. Disk is some kind of proprietary form type only found in Zenbooks. Image bellow is showing my ADATA and M.2 disk.


In 2.5 years I outgrow this disk and I had to upgrade to 512GB. Asus’s decision to use proprietary connector gives us a lot of troubles. To solve this issue we have to use an adapter. I bought this one (see edit 11). Here is an image if amazon stops selling it:


Disk I bought is Crucial M550 512GB SATA M.2 Type 2280 (CT512M550SSD4). You have to be careful because not all M.2 drives will work. It has to support SATA data transfer and not only newer and faster PCI-E mode!

To open UX31A you have to unscrew 10 T5 screws on the bottom plate. To change disks, you have to unscrew additionally one philips-head screew that holds disk in place. Here is a photo of disk and adapter fitted inside laptop. Adapter and disk is a bit thicker in comparison to old one. Bottom lid is a bit harder to put on, because of thickness difference.


To be on safe side I insulated the aluminum lid where it comes in contact with the disk with antistatic bag in which electronics usually comes in.

And because last post was on disk speeds, I must show you results of speed test on new ssd disk (left ADATA MX11 256gb, right CRUCIAL CT512M550SSD4):

ux31a - adata mx11 vs CRUCIAL

As you can see disk speeds were upgraded considerably. We will see how that will transfer to real life.

EDIT: Someone in the comment selection asked for disk speeds of the Transcendent disk. Because CrystalDiskMark changed its test I have redone tests on my CRUCIAL disk, so they can be simply compared.  As we can see Crucial has better writing speeds in nearly all the cases, and similar reading speeds.


EDIT: Check the comments section for additional details (how is disk working out after few days of usage) and tips on how to copy/transfer windows. 

EDIT2: Commentators Uli and Holger report that Sandisk X300 works too. (Thanks Uli & Holger for the feedback! )

EDIT3: Commentators Lars and Werner report that they used Transcend 512G MTS800 M.2 SSD and it works as expected.  Florian also used Transcend’s disk. (Thanks Lars & Werner & Florian  for the feedback! ).

EDIT4: Commentator Stefan used Sandisk X300 SSD M.2 2280 256GBSD7SN65-256G-1122 (Thanks Stefan for the feedback! )

EDIT5: Commentator Stephane used same adapter and “Transcend TS256GMTS800 SSD interne 256 Go M.2 (Type 2280) SATA III” disk on older model – UX31E .   (Thanks Stephane for the feedback! )

EDIT6: I have succesfully installed Transcend MTS400 M.2 SSD 256GB SATA III, MLC into my GF’s UX31A. This disk short one (42.0mm long, Type 2242) and it fits without a hitch. 


EDIT7: Commentator Eric used same adapter and “Samsung EVO 850, 500GB”. He reports some problems with back light and touch pad, we are still trying identify the problems and figure out if they are caused by the new disk  (solved: there were wrong screws in wrong holes).  Jakob reports that Samsung EVO 850, 500GB works but has ” a little tight fit”. Check below for in the comments.  Pete is reporting that Samsung 850 EVO M.2 250GB works as expected. Oliver used Samsung 850 EVO 250 GB M.2 3.5-Inch SSD (MZ-N5E250BW)  (Thanks Eric , Jakob, Pete, Oliver for the feedback! )

EDIT8: Alte has found new type of adapter that should minimize problems with thickness. (Thanks Alte!)

EDIT9: Acording to Michael Crucial 500GB MX200 Works as expected (Thanks Michsel!)

EDIT10: Svankius used Adata Premier Pro series ssd (ASP900NS38-256GM-C) (Thanks Svanikus!)

EDIT11: m3mp5  used different type of the adapter it’s smaller and could be better. (Tanks for the feedback m3mp5!)

EDIT12: Thanks to Sarah, please consider this comment  when deciding about adapter.

Original disk inside UX31A:



Insulating the lid where it could touch the disk with a simple plastic anti-static bag and some electrical insulation tape:



380 thoughts on “Upgrading to 512GB SSD on Asus Zenbook UX31A (update: UX31E too)”

  1. This past summer, I had the unfortunate experience of having my UX31A hard drive crash. Apparently, it’s a popular problem with those special connectors, so I haven’t replaced it and just been running Ubuntu on a thumb drive with it. I happened upon your article and am now seriously considering following in your footsteps. I do love the UX31A, espeically for it’s beautiful screen resolution. After you’ve gotten a little real life use out of it, I’d be curious to hear an update on how it’s working out; especially with the fact it was harder to close? Smart idea to use the anti static bag… hope it’s working out.

    1. Hi, laptop is my daily driver, I have been working on it at least 50 hours since installment, no problems detected since. I am really pleased with results. I haven’t noticed any speed improvements though, but then again I didn’t do any disk demanding operations lately, currently I am working on things where CPU and RAM are bottlenecks :).
      I waited some time before installing my 256gb module on GF’s UX31a (she has 128gb currently), because I didn’t know if everything will be ok, but I will be doing that in next few days, because everything works flawlessly on mine.

      For other readers: Idea how to use disk module you are taking out of the laptop – by buying this cheap adapter ( http://goo.gl/QQWcdo ) you get preaty awesome SSD drive for your stationary pc :). I have bought one which looks like this-one, I tested it and it works. I also used it to clone old and new drive with SATA-to-USB adaptor.

      EDIT: Rudnik sorry for late response, Gmail decided that notification about your comment is spam :(.

    2. Hello, I know UX31e does not support RAM upgrade. Could I fully replace motherboard with another one that could get 8GB RAM? Thank you in advance, Panos

      1. I haven’t even heard that anybody would try that. I think it can be done theoretically, but practically it is not – why not? Because you probably will not find board that will fit the case, you wont find one that would have the same internal connectors in the same place, that would have external connectors (hdmi, usb, …) at the same place, …

        As I said theoretically (on the bench) it could be done. I am really sorry that my UX31 doesn’t have 8GB of ram, but unfortunately this is not realistically possible.

        If I would desperately need 8Gb and decided I wouldn’t buy new laptop, I would try to research (If you are expert on electronics & soldering & and have all the necessary equipment) how could you possibly replace RAM chips and if proc and motherboard support that. And event then I wouldn’t give more than 1% chance of success.

        1. Jure, thanks for the solid answer. I love my UX31e but the RAM is a serious bottleneck. I should not buy a laptop with no RAM upgrade option in future.

          1. @jure

            it’s just a little joke thing that’s been floating around the internet for a while now haha

  2. Es muy simple de emplear y lo mejor es crear una cuenta para hacer tus listas de reproducción.

  3. Purchased the Crucial M550 combo witht the NGFF adapter for the UX31A
    I can fully agree with the description above, the combo works like a charm!
    Only the screw to remove the old Sandisk unit (in my case) was a little hard (risking to break the screw fixed too hard)… but managed to do it.
    Once installed, booted from USB stick and Acronis to restore partitions. Adjusted partition sizes to max disc capacity and off we go… The NGFF adapter can nowadays be purchased from Ebay for 12 USD, directly shipped from China it takes about 2 weeks delivery time. The Crucial SSD found 512 MB on Amazon for 239€ at this time.
    Many thanks and congratz to the author of this article!

    1. Great to hear that this post helped to another ux31a owner! Thank you for sharing your experience!

  4. Thanks, but how you been able to restore windows again, as the zenbook, came without a windows disc.

    1. First of all whenever I am doing stuff like described below on my hard drive, I do FULL BACKUP OF DATA I DON’T WANT TO LOOSE, I strongly recommend you do that too!

      There are multiple options:

      • [1] On first boot windows system asked you to make restore CDs/DVDs, you can use those for clean install of windows.

        the simplest way, but you will lose all your installed software on primary partition [C:] and probably also data partition [D:] will be lost, if you have it – 128gb edition has only [C:], 256gb edition comes with [C: and D:]. Therefore data backup is obligatory!

      • [2] To move everything from old disk to new one (no programs will be lost) let’s look at two options:
        • [2.1] Connect both drives and clone them. This one will be complicated, but just bear with me 🙂 It’s the way I did it on my laptop, [2.2] will be easier and will require a lot less tools and adapters.

          I left old disk inside laptop, I connected new disk via this adapter http://goo.gl/UUu6ZN and then put it inside this adapter http://goo.gl/SScpDT so I got SATA interface, then I could use adapter like this http://goo.gl/iiokzT to connect it to USB. I then used gparted(FREE!) to copy and resize partitions – good commercial tools that can replace gparted: Acronis True Image($, check if trial supports this), Paragon hard disk manager($, again check what trial can do).

        • [2.2] Using backup/restore. This is simpler way I used on my GF’s laptop (she also has UX31a)

          You create a USB bootable version of your favorite backup software (Gparted(it’s free), Acronis True Image($), Paragon hard disk manager($), Norton Ghost($). You leave old disk inside, backup whole disk to a USB drive, perform disk swapping and then restore and resize partitions. Again, I highly recommend free Linux tool called gparted. These tools might not recognize USB 3.0 drives due to missing drivers; if that occurs, connect USB 3.0 drive with a USB 2.0 cable and it will work – for example cable you use to charge android phone.

      After copying hard drives using [2.1] or [2.2] there is option that disk won’t boot (due to hard disk signatures, missing correct boot partitions MBR/GPT), all these problems can be solved with tools available on windows install disk (that you can download for free, because you have valid license) and you use it to “repair windows” or even better you can use tools on Hiren’s boot cd to manipulate/edit boot records.

      Yes, I know that laptop doesn’t have CD/DVD drive, not everyone has external USB CD/DVD drives and all utilities listed above require boot CDs. There is simple solution to this: You can always use Universal USB Installer to “burn” .iso image to a USB drive and use it instead of CD.

  5. Hi,

    My SSD decided to quit working. I need a new one and a way to restore the files on the XM11. I guess I’d better upgrade as well. It’s not going to be a cheap fix I think.

    What do you guys suggest now for a new SSD?



    1. Hi,

      as stated above be careful when choosing disk, because it has to support older SATA transfer rate! Some newer disks supposedly support only PCI-E mode (which can be a lot faster), but it won’t work in UX31A.

      I am satisfied with CT512M550SSD4, it works fast no problems so far, it has been my daily driver for past 2 months (+10 hours/day of usage).

      Price will vary with the size of the disk you choose; 128gb will be ~100€ all together, for 512gb it will probably be around 3 times that.


      EDIT: User that posted comment bellow says that SANDISK X300 works too!

      1. Just upgraded to 512GB. Crucial disks CT512M550SSD4 unfortunately are not produced anymore. Therefore a Sandisk X300 M.2 2280 512GBSD7SN6S-1122 has to do the job, it works quite fast (AS SSD Benchmark: 828, crystal dm: seq read. 511 MB/s, 470 MB/s writing). Paragon software was used to migrate, however windows repair via usb stick was necessary to arrange correct booting as mentioned in the posts. Thanks for the nice description, which kept me very well prepared for this upgrade job.


  6. Thank you very much for the thorough description including the fotos! Since a few months, my ADATA ssd was sporadically creating blue screens, and Asus support only gave me the option to send in the UX31A, and have the ssd wiped and maybe replaced. Therefore, I ignored the problem – until 2 nights ago, when the SSD controller died completely.
    Thanks to your excellent post, I’m now using the UX31A again: because the Crucial is currently not available, I’m running a Sandisk X300 instead.
    Thank you very much again!

    By the way, I’ve sent in my old Adata mx11 to a data recovery service. However, they told me that due to the Sandforce controller used on the Adata (encrypting), no data can be recovered. Does anyone have experience with recovering data from a damaged Adata mx11?

    1. Hi,

      thanks for feedback. For the users that will come to this blog post in the future, could you post full model number of the disk, so that they will know which disks were tested and worked? I am asking you, because that was my biggest fear when selecting new ssd; I didn’t know for sure if disk will work… I will include model number in the original post and give credit to you.

      About recovering: Did you have SSD encryption enabled (in BIOS)? If you didn’t – have you tried to mount disk in linux environment (that helped me once to obtain partial data from failed disk)?


  7. Thanks Jure for your support,
    Yes the Crucial M550 512GB SATA M.2 Type 2280 is out of stock or not available anymore.

    The SanDisk SEEMS to be this one:
    SanDisk X300s – Solid-State-Disk – 256 GB – SATA 6Gb/s
    – intern – M.2 ( M.2 ) – SATA 6Gb/s
    Size: 22 mm x 80 mm x 2.23 mm

    price starts for 256Gig at 156euro.

    i think i will try this one with the adapter.

  8. Thank you for posting this! Took your advice and ordered a Transcend 512G MTS800 M.2 SSD from Amazon along with the Sintech NGFF M.2 BM Key SSD to 18Pin Adapter Card and the upgrade from my original 128G SSD took less than half an hour. The worst part was not initially tipping the SSD up to properly seat it in the adapter. The second worst was a tie between getting the adapter screw that holds the SSD in place tightened and the three and half weeks it took the adapter to reach my doorstep via oriental steamer.

    I had downloaded Windows 8.1 to a USB 3.0 drive earlier and the install to the new SSD was fast and painless. Best of all, copying my data back to the new drive was incredibly quick – transfer speeds were consistently between 130 and 140 Mbps!

    If you end up outgrowing your UX31A’s original SSD, you now have no excuse not to upgrade!

    1. Lars, I am glad you shared another success story here! I stated your disk model in the original blog post and gave credits to you, I hope that’s ok with you. I hope disk will serve you well 🙂

    2. Dear Lars:

      I like your set-up method very much and hope to follow it, thanks a lot. I have 2 more questions:
      1. Is this Transcend/Sintech set-up too thick for the ultrabook case to close easily?
      2. What adapter/cable are used to clone the whole old SSD to the Transcend SSD before I swap them? (My Asus is Zenbook UX31A, with 128 GB SSD , but only with USB2 ports).
      Thanks again.

      1. Thanks to All, I have completed my UX31A upgrade following your suggestions, using Transcend 512 GB and the Sintech adapter. No problems.

  9. Happy to return the favor, jure. After a couple of weeks of use, I have had no issues at all and am enjoying a much snappier Zenbook as well. I backed up the data I wanted and opted for completely new install of Windows. The laptop came with Window 8 installed (but had been updated to 8.1) and NO product key on the bottom. I read that activation info now resides in the BIOS and I wasn’t sure if I’d be able to update. To be safe, I used Belarc Advisor (http://www.belarc.com/) to extract my Windows key then downloaded 8.1 from Microsoft (http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media) to a USB 3.0 flash drive. Be aware that the download will reformat your flash drive to be bootable so any files on it will be deleted. Along with the Transcend 512G SSD ($230 USD) and Sintech adapter ($20 USD) I purchased a Torx tool set from Amazon for $7 USD and that was all I needed for the upgrade. Windows 8.1 install did ask for the key so I was glad I had that handy. Be prepared for numerous Windows updates for a few days, and you’ll probably need to get a few drivers from ASUS too, but I am very happy to have a smooth functioning and bloatware-free operating system now. Again, thanks for this post. I doubt I would have attempted this without reading of your success here first.

    1. For future readers: Asus seems to have deiced the ‘best’ place for wndows key sticker is … the bottom of the power block.

  10. This thread is awesome, I’ve had a UX31a for 2 years now and I’m (like some of you) at the point of wanting to upgrade the SSD. I’m following the developments here with big interest and I want to do upgrade too, but my main concern is that I’ve never opened my UX31a. I’m afraid to screw it up. Is there, by any chance, someone who has some guidelines on how to accomplish such an operation (that is: some noob-proof guidelines)?

    1. Hi, I think all of us will happily help you. I dont think you really can screw up anything.
      It’s just as simple as taking 10 screws out, removing one screw that holds disk inside (in picture 3 the one that is covered with yellow warranty sticker).
      You then assemble adapter and the new disk (requires tightening of 1 screw that can be seen in picture 3 next to the one covered with yellow sticker), you then use this assembly and put it the spot where old disk laid and secure it with the screw (yellow one).
      As I advised befor I advise you to insulate aluminium lid, where it could touch the disk (so we don’t get any unwanted electric shortcut). After that you only put back lid back on and secure all 10 screws.
      Lid will go a bit harder on because added thickness of the disk, but you dont have to worry about that if you insulated the lid, aluminium lid will deform while tightening 10 screws, but won’t be noticeable at the end.

      If you are not to sure about what to do I can open my ux31 back up and make additional photos and instructions. It’s quite simple job 😉

  11. Thank you! Your description is detailed enough I am sure. I will carry out this operation in a few weeks (since I’m just a student I will have to wait for my salary first..) and I will keep you guys updated!

  12. So pleased you’ve posted this. It’s always a relief when you have a niche problem to discover you’re not alone. Especially when the help is this good!
    I’ve had the adapter sitting at home for a while now and I’ve been putting off buying a new SSD, but as the BSODs become more and more regular I don’t think I can procrastinate much longer! Do you know if a 2260 form factor SSD would work instead of the 2280 (that is, would the 60mm long be a suitable replacement for the 80mm long unit)?
    Many thanks,

    1. Hi,
      well as you can see the adapter is build for different sizes (the one I liknked), so my guess would be that it fits. I don’t have other M.2 disks to test them on my adapter. The only way I can see that they wouldn’t fit is if they were significantly thicker. Looking quickly on google I found this resource: … M.2 standard requires the SSDs (or, other types: WiFi, Bluetooth etc) only have chips on the upward facing side…. It seems to me that shorter disks cannot be significantly thicker, because you can’t just stack NAND chips one on top of the other. These newer disks can have shorter size because NAND chips have bigger capacity.
      Therefore it should fit.

  13. My UX31A SSD (Adata MX11, 256GB) stopped working after 3 months of ultrabook purchase. Asus replaced it with the Sandisk U100. 2 years later, the Sandisk got incredible slow (1MB/s write speed). The operating system got freezing every now and then (during write access).

    Now I replaced it successfully with the Transcend MTS800 512GB, M.2 6Gb/s and the M-ware® Adapter NGFF M.2.
    The M-Ware adapter was pre-installed with screws to mount the new SSD.

    Btw.: I used the Clonezilla Live Distribution to backup/restore the whole disk to/from an external USB 3.0 Harddisk.

    CrystalDisk Mark 3.0.3 x64 results (Transcend):
    Seq 514MB/s (read), 468MB/s (write)
    512K 332MB/s (read), 444MB/s (write)
    4K 22MB/s (read), 53MB/s (write)
    4KQD32 248MB/s (read), 219MB/s (write)

    Thanks a lot for this blog!

  14. After reading all of yours comments I feel very lucky. My UX31A with ADATA MX11 256gb ran without a glitch for 2,5 years (every day at least 6h on time) only in past few months I noticed few blue screens of death (BSODs). Because they occurred in predictable way (when on battery and battery fall below 20%) I thought that it’s problem with worn out batteries.
    Now when I have changed disk to the new one BSODs are gone, therefore I conclude that It had to be the disk.
    Also my gf has UX31 with 128gb sandisk and she didn’t experienced any problem with the disk for 2 years, then problems started occurring (some files unreadable), I will have to swap that disk soon.

  15. Hello,
    after waiting for the ssd and adapter, here the news: it works!!!
    X300 SSD M.2 2280 256GB

    and adapter:

    M-ware® Adapter NGFF M.2 HDD zu XM11 . Zenbook UX21 UX31 UX51 ID14822

    as my SSD died on me, i have to install Windows from USB.
    little tricky, but here some help,

    I managed to boot my UX31a from USB.

    1: Enter the BIOS setup menu by pressing and holding F2 key, then press the power key.
    2: Switch to “Security” and set “Secure Boot Control” to Disabled.
    3: Press F10 to save and exit.
    4: Press and hold F2 key during reboot and enter the BIOS again
    5: Switch to “Boot” and set “Launch CSM” to Enabled.
    6: Press F10 to save and exit.
    7: Press and hold ESC key to lunch boot menu when the notebook restarts.
    (Please note the change of key that needs to be pressed during reboot from F2 to Esc)
    8: The USB device will now be visible as a boot option.

    been able to close the cover nicely, only my Window 8 serial number is still missing.
    waiting for ASUS to give me the Key .

    thanks all!

  16. Hi,
    Does anybody knows if these ssd change procedures are applicable to the Zenbook UX-21 of 11″?
    I would like to upgrade my 64GB SSD to at least a 128GB one. If anybody wants to sell his old SSD I would be a happy buyer…

    1. I dont know if it will fit. Open up your laptop, take some photos, compare, see if there is enaugh space. My guess that it will fit.

      I wouldn’t advise you to buy used disks from these laptops seeing how many are failing in 2 or 3 years of usage.

  17. Hello from Canada! Thank you all SO much for this discussion. I have a UX21a and am at the point where I’ve outgrown the original128GB HD. When I originally did some research I found many people with the same problem, but not many who solved it. I found people who mentioned the Sintech NGFF, but nobody with pictures or experiences with using it. Huge thank you, again.

    I’ve ordered the Sintech NGFF (China post delays…). My question is regarding weather I should buy the 42 mm TS256GMTS400 (http://www.amazon.com/gp/product/B00KLTPUG4/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER) -OR- the 80 mm TS256GMTS800 (http://www.amazon.com/Transcend-MTS800-Solid-State-TS256GMTS800/dp/B00KLTPUYG/ref=cm_cr_pr_product_top?ie=UTF8) -OR- if it matters. Any assistance would be most appreciated. Thank you!

    1. I dont think that we have any successful report of this procedure un UX21A (only UX31A). But seeing images like this it seems that disk is indeed the same shape and size so I would reccon that this will work.

      I don’t have time to check disks thoroughly now, but if disks are the same, I would go for the smaller one (because in the future if you will be upgrading notebook you have higher chances that smaller ssd will fit into new computer). In the comparison chart on the amazon, it states for one: Optical Storage Write Speed 160 and for the other one Optical Storage Write Speed 310. I would double check this on the manufacturer’s website. If one is really significantly faster I would chose that one.

  18. to finish my experince,
    i been not able to find the windows 8.0 retailer version online, to use the OEM Key what is set in the BIOS.
    ASUS support can not help here and i needed to buy a windows 8.1 pro version on ebay, what i got for only 26.50 euro. =)

    thanks all again, i love thos netbook, butjust backup the first time you get a blue screen, it´s the SSD what gone fail soon.

  19. Thanks a lot for this blog post, I’ve waited two years for something like that!

    My ADATA SSD crashed some years ago and Asus replaced it with the SanDisk model that is so much slower. It really ruined the UX31A for me because the frequent lags (whenever there was disk activity) got really annoying.

    Now I ordered the Transcend SSD (256 GB) and the NGFF adapter via Amazon (delivered the next day) and installed it without problems. The adapter makes the SSD really thick but once the Zenbook is closed it’s barely noticable.

    Regarding performance: The SanDisk SSD from Asus had the following write speeds (Seq, 512k, 4k, 4k QD32):
    180MB/s, 5MB/s, 8.8MB/s and 7.1MB/s

    The Transcend SSD on the other hand:
    309MB/s, 306MB/s, 44.3MB/s, 289MB/s

    This really shows how badly the SanDisk SSD performs. Boot time (from pressing the button till desktop, i.e. with the fixed BIOS time) has been reduced by 34%.
    As you can imagine I’m really happy now and I want to thank you once again for this blog post. I wouldn’t have found out about that adapter otherwise.

    1. Hey Florian,

      Can you give me the links to the products you’ve put in your Asus notebook? I really need a replacement soon. Cheers 😉

        1. Ok so that adapter and then a not to costly SSD. I tried getting the recovery USB working today but it seems the SSD really is corrupt. Though someone managed to recover some video’s from my Thailand backpack adventure so that is really sweet. But back on the topic, what SSD you recommend for my UX31A i7? And wil it fit in the original casing with the adapter? Cheers!

          1. I am original poster of this blog, so for my UX31A (i7 256gb) I choose Crucial M550 512GB SATA M.2 Type 2280 (CT512M550SSD4). It’s working as expected for more than 4 months now.

            For my girlfirend’s (she isn’t as heavy user as me) I chose Transcend MTS400 M.2 SSD 256GB SATA III. I ordered it a few days ago, therefore I haven’t installed it yet and I can’t comment how it preforms.

  20. Ok, as soon as I have some money I’ll go for the upgrade. One last question, Is it necessary to cut in the casing? Will it fit with the adapter?

  21. I dont know what you mean by “cut”. Like i have writtwn in original post I didnt have to cut anything. It’s tight fit, but there is enaugh space. Like I said I only insulated the lid to be 100% that it cant cause short on the disk. Just read carefully original post.

  22. I’d like to add my own tips to this great blog post.
    I haven’t yet performed the upgrade, but have just ordered the adapter.

    Re: Adapter availability
    All the Amazon web sites (.de, .co.uk, .com) are showing ‘Currently unavailable’ for the the adapter, but it appears to be in-stock from the Leipzig vendor – It cost me 37 eur which included DHL courier.

    There’s another adapter on amazon – but I suspect this may not be suitable for the UX31A.

    Re: Problem symptoms and finding out if SSD is at fault.
    The first problems I had were freezing of the OS in mid-use. I could re-boot, but only got 5-10 mins before freezing again. I contacted ASUS support in the UK, who suggested that the SSD was likely ok and I just needed to refresh the OS, so I purchased the media from their link at a cost of £61 but the refresh failed with ‘cannot copy image to c: drive’.

    I created a USB bootable Win 8.1 drive (old hdd) using WinToUSB from here plus the Win8.1 Pro IOS from Microsoft .

    This is better done with a USB stick as the HDD is not spun-up before the boot menu appears, but you can get around this by going in to Setup and immediately exiting (again pressing Esc to get the boot menu). Second time the boot menu comes up, the HDD is listed as a boot option.

    BTW, you need to go to the Setup security tab and turn off safe-boot, also on the Setup boot tab turn off fast-boot then turn on CSM mode.

    The site with instructions for creating a bootable USB is here.

    There’s also a test tool for the Adata SSD (if that is what you have in your UX31). I didn’t find it useful, the full diagnostic went a lot faster than it states on-screen, and didn’t report any problems, so I suspect it just did not work.

    I managed to run CHKDSK on the d: drive of the SSD and it ran ok without finding problems, but could not get a complete run on the c: drive, the process froze soon after starting.

    Re: Win8 product key
    As suggested by a previous comment, I tried the Belarc utility to find the Win8 product key in the BIOS. It reported a product number, but this did not work with the ISO downloaded from Microsoft. I see from other comments that Asus aren’t forth-coming with a product key, so I’m not sure of the best approach for this. It is possible to find information on generic keys on superuser.com.

      1. BTW, you might be interested to know that the fault occurred 1 month short of the end of the 24 month warranty, but Asus refused to fix it because I had purchased through Amazon Marketplace.
        If bought direct from Amazon, the warranty would have been valid.

        Amazon were aware of this, and share some of the blame for not making it clear in their advertising that there was NO WARRANTY whatsoever on the product.

        Asus also should have said something when I registered the serial number with them.

      2. Hi, I tried to correct your URL links :).

        The adapter you are linking seems to be usable if you would want to connect normal disk to the computer, but no normal disk would fit inside notebook. It seems that it is only adapter from UX31A connector to normal SATA plug.

  23. First, I would like to thank the author of this post and all the contributors. This helped me a lot to upgrade the SSD of a UX31E model with SanDisk 128GB model.

    For me, I used
    the “Sintech adapter purchased via Aliexpress mentionned in the post,
    and the “Transcend TS256GMTS800 SSD interne 256 Go M.2 (Type 2280) SATA III” (amazon.fr).

    The disks replacement was simple, no partcular issue to report.

    For the content, I used an external USB2 disk with Gpart et Clonezilla (that part take a lot of time due to USB2) :
    1/ clone the original disk to the external disk using Clonezilla live (before the replacement).
    2/ use GPart live to copy the partition from the external disk to the new installed disk.
    3/ The new disk did not boot
    4/ Boot from the external USB disk, and did Partrec (I’m not sure which is the good, I tried several commmands including Partrec /Rebuildall
    5/ Reboot from the new disk, it worked !

    For the performance, the old SanDisk was really slow and there is a real boost. The UX31E becomes usable now!

    So thank you again for your excellent post!

    1. Stephane, let me get this straight. Your post is the first one that mention UX31E and not UX31A. Is that right? Does this “guide” work also for the Asus UX31E?

      Thanks, Jure

      1. Hi Jure,
        Yes, the model is UX31E purchased on 23 Jan. 2012 with Windows 7 (I think that this model was one of the first Zenbook).
        And the guide described by you worked without glitch.

    2. I definitely would like to thank the author for the post, and also I’d like to thank Stephane for this comment.
      I was a little bit scared of changing ssd, but I used the same setup as Stephane mentioned, and everything worked out well.
      Now my UX31e is usable again.

  24. Thanks for the information. I got the M2 to 18 pin adapter and a SSD, put it in. Now the challenge is to get the Windows 8 (or 8.1). I called ASUS customer service and they are asking me to send the lap;top to them to put the image, and it’s gonna costs $410 for them to put it. They cannot give the Key. Donno what to do. The rep says that other option I have is to go and buy a commercial license for WIndows. I asked him why I should buy or spend $410 ridiculously in spite of spending $1000 to buy the laptop. he has no answer. Please help !

    1. Is old disk in running stage? Did you created recovery disks at first boot? You should give more information.

  25. Hello all.
    Thanks for very usefull post and comments. I am in the same situation as many of you with my ADATA failing.
    I have looked at available drives and I was wondering if any of you have tried the Samsung 850 EVO M.2 2280 SSD 500GB?
    It gets great reviews and is without any components on the rear side it only measure 0.8 mm in height so it seems attractive for this purpose.

    1. Hi.

      Did you try the Samsung 850 EVO M.2 disk and does it work OK? I am thinking of upgrading my 128GB original drive as it is full and the 256GB version of the Samsung 850 EVO M.2 plus the adapter are both currently in stock on amazon.co.uk, so thinking of ordering them. Current prices £92.99 & £17.87, total £110.86.

      But the unknown in the compatibility of the Samsung 850 EVO M.2. as no one seems to have tried it yet! The specs and reviews look top notch and it does support SATA only, so good signs I think.

        1. I have bought the Samsung EVO 850, 500GB and received it, but I am still waiting for the adapter from Germany. I will report back when I have tested.

          1. I can confirm that the samsung 500GB 850 EVO works perfectly. It fits a little tight though, and it seems that the keyboard is slightly elevated where it is fitted.
            Thanks for the guide.

  26. My ADATA just crashed last week so that I will try to replace it as well. Adapter and Transcend 512G MTS800 M.2 SSD is already ordered.

    It is a shame that these ADATA SSDs are failing after such a short time. I would have expected ASUS to use better SSDs.

    1. I am trying to keep original post updated with all disks that have been reported to be working either by me or other commenters. I don’t have report that MX200 has been successfully installed.

  27. I’ve tried the Samsung EVO 850, 500GB, and it works. However, i got some problems with the touchpad after screwing the backlid back on, as it is very tight.

    I guess there is some tension in the chassi that makes it go completely bananas. As I usually use a mouse this is no major issue, but I will try to fix it later.

    Did anyone of you experience the same problem?

    Kind regards

    1. Hi I have changed two disks on two Asus: UX31a i7 and UX31a i5 and I didn’t have any problems on any of them.

      Did you make fresh install of Windows on new disk? Is it possible, that there is something wrong with drivers on new installation on new disk? Or did you clone windows install? I can imagine why would changing disks cause such problems… Did you insulate disk towards chaise as I proposed?

      1. Okay. Yes I made fresh installs of Win7, and insulated the lid like you. The drivers works just fine. Actually, the touchpad “works” in the sense that i can move the cursor around, but if i press the buttons, they feel kinda stuck, or hard to press, so to the point that the touchpad is pretty much useless.

        I’ve experienced similar problems before, for very brief periods of time, when using the laptop in odd angles. So I’m fairly certain that it because of some kind of tension… I’ll try to work it out when i come back from work.

        Thanks for the home page btw, brilliant instructions! Almost threw the thing out of the window when i realized that Asus use that malfunctioning piece of shit proprietry disk..

        1. I tested and can I see that if I click on the right spot on the bottom of the notebook I can hear touchpad click. If I were you I’d unscrew screws that are on the bottom part of the lead (those near touchpad) and see if problem goes away.

          If that is true it must indeed be problem with tension.

          Honestly I have taken my laptop so many times apart that I have lost some screws. Actually, I don’t have screwed-in those two that are nearest to the touchpad. I thought that those two are safest to be left out, because there is battery behind them 🙂

          1. It seems like the touchpad and everything else works now. I’m not really sure how I solved the problem, I just kinda randomly unscrewed and screwed the screws for about 2 hours 😛 It was obviously some problems with tension, which made the touchpad to automatically press down one button.

        2. Thanks very much for this thread. My Zenbook cover came right off, and as others posted, I nearly stripped the threads of the screw holding in the original Sandisk SSD. But I got it out.

          I can confirm the Samsung Evo 850 is a tight fit. But it doesn’t really stick up much further than the adapter itself. What I mean by “tight” is everything works fine, but putting on the back cover, the cover seemed to have a little “spring” to it that it didn’t have before. Had I not read comments here, I probably wouldn’t have noticed.

          Based on this reading, I tried the computer before and after screwing down the cover, and no difference. Everything works fine. When I checked prices, for me the Samsung was way cheaper at the time, otherwise I would have picked one of the ones you all reported that doesn’t have any issue. But the Samgsung works great, with a 2-10x improvement on every measure of CrystalDiskMark. – Fred, Missouri USA

  28. Eric, I hope you did screw right screws in right holes – two screws are different (longer) than other eight? 🙂 Anyway, I am glad you solved the problems.

    (For the reference for others: two longer screws have to be in the middle two holes on the side which is closest to display. In other words two holes that are between vent holes near display)

    1. Haha, yes I can’t see that i would fit the two longer screws anywhere else than where they should be. Anyways, just glad it works now!

  29. Hi all,

    I’ve substituted the dead SSD of UX31A with the following hardware:
    M-ware Adaptateur NGFF M.2 HDD vers XM11 pour Zenbook UX21/UX31/UX51
    Transcend TS256GMTS800 SSD interne 256 Go M.2 (Type 2280) SATA III

    Hardware installation went smoothly. Back closed without any problems.

    Unfortunatelly I did not have the Asus restore disk so I did fresh Win7 installation followed by installing the drivers from the ASUS website (for completeness thread discusses the procedure).

    After all the manipulation everything works smmothyl except the webcam and the microphone. Those to do not appear anywhere. I’ve tried to boot with Ubuntu Live CD and find the webcam, but I could not find it as well.
    In win7 sometimes I receive a report that there is an unknown USB device but device manager does not have any trace of it.
    Does anyone have an idea how this can be fixed?

    Does anyone have an image of the ASUS restore disk with win7, home premium, eng?

    1. Jure, I forgot to say that the description of the SSD replacement procedure was reaaly helpful. Thanks a lot!

      As I under stand you have access to the 2 laptops UX31A.
      Will it be possible to make a recovery ISO and share it?
      Thank you in advance!

      1. Hi,
        for my UX31 I bought upgrade to win 8 (and it came with 7pro not home), therefore I don’t have those recovery disks any more. The other one (intel i5) came with windows 7, but my gf didn’t make any recovery ISO – had problems myself when I was upgrading her disk. I luckily made some backups of her laptop years back, that I was able to recover – I don’t think I can share backups of hers due to windows licensing and also licensing of other installed software. I can look if I have any webcam/microphone drivers somewhere, but this week I am away, so I will be able to do that next week. Please remind me if I forget to do so [just leave new comment here and I will get email 🙂 ].

        1. Jure,
          To sum up the story: after multiple reinstallations of drivers, the microphone is working again (I do not really know what helped).
          Webcam is still not working.
          I tried booting from external USB with Linux and it did not see the webcam as well. The same distro sees the webcam on a different ASUS zenbook.
          I’ve concluded that there is a hardware problem and there is no hope 🙁

          Thanks again for the useful post.

  30. Jure, thank you very much for your very helpfull post. It gives me hope to revive my Asus UX31a.
    I’ve ordered SINTECH NGFF SSD HDD to 18pin adapter at Aliexpress (http://www.aliexpress.com/item/SINTECH-NGFF-SSD-HDD-to-18pin-adapter-as-sandisk-sd5se2-SDSA5JK-ADATA-XM11-SSD-for-Asus/2021490950.html) and plan to substitute my dead 128Gb A-Data XM11 with Transcend TS256GMTS600 (S400 and S800 are also being considered) when it’s arrived.
    While I studied Asus UX31a replacement experience through the net I found only one report about back cover that couldn’t be placed without modification after SSD+adapter replacement.
    You can find it here (Daniel is the one who experienced the issue): https://ru.ifixit.com/Answers/View/200552/Replacement+of+the+SSD
    He used the same adapter/SSD pair as you but met some back cover problems.
    My question is could you please give me advice regarding what SSD form-factor with adapter will fit Asus UX31a case better: 2240, 2260 or 2280? (You tried 2240 and 2280 so I hoped you could help me to decide which one is better choice).
    Thank you once again for very useful post.

    1. Hi, regarding the size: Yes I have installed both 2240 and 2280. The one I installed in my pc (Crucial M550 512GB SATA M.2 Type 2280) should perform better, than the one I installed in my gf’s. But that is not due to physical size, but it’s due to its performance – better disk, better onboard chips, better read/write speeds. I don’t think size makes any difference. Smaller disk usually have smaller number of chips, but chips are bigger in capacity. Smaller disks should theoretically produce more heat (per surface area) but I think manufacturers know that and design these disks so that they shouldn’t have any thermal issues.
      As I think I have already written somewhere – If I would be choosing between two disks, that would be the same (only difference in size – same performance regarding speeds, capacity, etc.) I would probably choose smaller one – why? If in the future I would have new laptop/pc and I would like to transfer disk in new-one there are better odds that I can fit smaller disk in that new machine. (It might accept only 2240 size and not 2280.)

      1. My biggest concern now is laptop’s integrity.
        As it seems to me write/read speed of Transcend GMTS400-800 series (310/560) is slower than Crucial’s (500/550) but is equal to original A-Data XM11 and I’m OK with it, laptop still work very fast.
        However, if I could avoid any mechanical problems during the installation by using of smaller SSD I would be happy (especially taking into consideration Daniel’s back cover issues from my previous post).

        1. If you ask me, problems could occur only with thickness – length really doesn’t make difference, because original disk is even longer. Than make sure that you get as thin disk as possible.

          Reading Daniel’s response on your link – maybe the difference is in insulating the disk towards housing as I have pointed out in the post? SSD disk should work without problems even if they are pressed together (ssds doesn’t have any moving parts, etc.). Reboots could occur if there are some electric problems – e.g. shorts.

          Edit: Again, someone could argue that back cover is a bit bent after this upgrade, but you really have to look at it closely and know how laptop looked before upgrade. But I rather have this vs broken laptop.

          1. Ok, thank you very much for your response, it is much appreciated.
            Will try to fix my laptop when adapter arrive, hope everything will be fine.

          2. So, I replaced my failed A-Data XM11 128Gb with Transcend SATA 256Gb (TS256GMTS400) MTS400 using Sintech adapted (link for the product is in my first comment).
            Replacement went well; now laptop is working for two days without any concerns. SSD read/write speed is similar to shown in original post by jure (550/310 MBps).
            Combination Adapter+SSD is significantly thicker then original SSD – new SSD is contacting aluminum cover (which now is sitting in place tighter than before) with it’s chips so you need to isolate them to avoid possible short circuit (I used insulation tape but later I will change it for antistatic film – exactly how it is advised in original post).
            I didn’t have any recovery image so I just install Windows 8 from original installation image and it has read key from laptop’s bios.
            All drivers work fine (I din’t even install any – except touchpad and short keys software), camera works fine as well.
            Now I revive my laptop more than twice cheaper than it could cost me in official service and quite happy with it.
            Thanks to jure and all the commenters for sharing their experience.

  31. Just to verify that I took delivery from amazon UK of:

    Samsung 850 EVO M.2 250GB: http://www.amazon.co.uk/gp/product/B00TWISAS0?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00

    Adapter: http://www.amazon.co.uk/gp/product/B00NN4HESQ?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s01

    ….and thanks to the excellent guide here I have now successfully changed my original Sandisk U100 128GB, which was running of space, to this new 256GB drive.

    Just for info, I simply used the built in Windows 8.1 System Image Backup utility, and then made a Bootable USB recovery, also in the Windows 8.1 tools. I then booted the ASUS from the USB bootable drive (in the USB 2 left slot) and then restored my Image from my Backup drive (in the USB3 Right slot). I then had to Expand the C partition up to 256GB using the Windows 8.1 Disk Management tool. Obviously using this process I did not preserve the ‘hidden’ ASUS recovery partition on the original U100 drive. But I don’t ever recall ever using this anyhow in the 2.5 years I’ve had the Ultrabook!

  32. Just a follow up from above, here are my new speed tests for the Samsung SSD, which is a pretty impressive performance increase over my Sandisk U100, which was often struggling to reach 1Mb/s ! The whole machine feels a lot more zippy!

    AS SSD Benchmark 1.8.5611.39791
    Name: Samsung SSD 850 EVO M.2
    Firmware: EMT2
    Controller: iaStor
    Offset: 1024 K – OK
    Size: 232.88 GB
    Date: 29/05/2015 08:19:50
    Read: 507.53 MB/s
    Write: 489.32 MB/s
    Read: 32.86 MB/s
    Write: 63.63 MB/s
    Read: 377.91 MB/s
    Write: 244.44 MB/s
    Access Times:
    Read: 0.084 ms
    Write: 0.052 ms
    Read: 462
    Write: 357
    Total: 1065

  33. Hi,
    I own an Asus Zenbook Prime UX31A and my SanDisk SSD crashed. I’m looking to replace it by using the 18pins to m2 adapter.

    I saw about Transcend MTS400 M.2 SSD 256GB SATA III, MLC that it fets in the UX31A, but is it fiting in the Prime Version?


    1. Hi, as far as I know All UX31A are “Prime”. In the years when these Zenbooks were made, I think Asus used word “Prime” in the laptops that had 1920×1080 display and achieved some other standards (color accuracy, brightness, ssd). I know my is Prime and also one from my GF. The answer is then YES, definitely.

      1. so if i use the transcendent as other user used i don’t need to modify the case,right?
        Transcend MTS400 M.2 SSD 256GB SATA III, MLC

        SHORT ONE

        1. For the things written on this blog you don’t have to modify case. Only thing I recommend people to do is insulating the lid towards the disk. Disk and adapter fit the ultrabook; it’s tight fit, but you shouldn’t have any problems.

          I will add photos of my insulation.

          1. My adapter has just arrived so I am choosing particular SSD model now.
            First I stopped at Transcend SATA 256Gb (TS256GMTS400) MTS400. But now I see many reports about low Write Speed of this model (about 150 Mbps).
            June, you have this SSD installed if your GF’s laptop. Did you do Crystal Mark Test after innstallation?

          2. P.S.: Jure, sorry for wrong spelling of your name in my previous post (like ‘June’) – this auto correction is killing me )

          3. I didnt because she isnt heavy user (that is why I chose cheaper, slower disk?).
            I can do that today and post results in the evening.

            Edit: Volodymyr, see the post for speeds you asked.

  34. A small offtopic, is your ux31 geting hot? While idle it gets about 50-60 deg C. While the cpu is at 100% it gets about 89 deg C (stress test). Is it ok?

    1. I didn’t notice that it would be getting any hotter. I will try to perform some stress tests after work, when I come home.

  35. Great to find this webpage to guide me for the SSD replacement on my Asus UX31E.
    Have ordered the Samsung EVO 850 500GB and M2 Adaptor.
    However I have questions on the Windows7 installation. I would like to install a clean install of the Windows 7 Pro on my new SSD.
    Anyone can advise how to go about doing it? Couldn’t seem to find much help online.
    Realised I couldn’t download the iso from Microsoft Recovery site as my laptop comes with the OEM product key and not retail product key.

    1. Hi if I were you, I would clone disks (therefore no clean install of Windows7) and wait until end of July when windows 10 will be available. When installing windows 10 probably we will be able to select “fresh install”. I dont think it is worth for this 1,5 month to do full install. 🙂
      How to “transfer” OEM key to fresh install I have no idea :S I always create backup images on first boot of such hardware.

  36. Thank for the great write-up on this procedure! I had the Sandisk and after a year it just slowed to a crawl. Asus’ technical support only offered “restore the OS to factory” which I declined to do as I know that won’t fix a hardware issue. I just lived with it for over a year and finally found this blog in May and decided to do something about it.

    Anyways, I wanted to report that I as well used a Samsung 850 EVO 250 GB M.2 3.5-Inch SSD (MZ-N5E250BW) for the disk and the NGFF M.2 B KEY SATA SSD to Mini PCi-e mSATA 18 Pin Adapter card 22x30mm 22x42m 22x60mm 22x80mm for Asus UX31 UX21 Zenbook — both from Amazon. The only issue I had was the screw for the drive didn’t line up correctly with the adapter so the drive wants to pop up at a 45 degree angle. I also used some anti-static material on the inside of the case and just let the case hold it down. It’s worked great so far.

    I decided to give Windows 10 Preview a try and everything seems to be working just fine.

    1. Oliver, glad to hear that. I am really excited to see that Windows 10 is working fine on UX31A. Cant wait to install it in two months, I’ve been testing it from first release in virtual environment and it has some nice features that I missed when not using linux.

      Is all the hardware (mice, camera, … ) working well? How is trackpad, are three, four finger swipes detected as expected? How is power management (battery saving mode, full power mode)?

    2. Hi Oliver,

      I have ordered the Samsung 850 EVO 250 GB MZ-N5E250BW as well and I ordered the same adapter. Has the popping up of the SSD drive caused any problems? Do you expect it to cause troubles or shouldn’t we be worried about that, as long as anti-static material is used?

  37. Jure, I can’t say I’ve thoroughly tested everything as I really haven’t had time but for general stuff like web browsing and running some basic applications it works. I noticed that the Device Manager shows several “Unknown Devices” but when I tried to get into it more I got a weird display glitch in Device manager and couldn’t get into the details. I gave up on that hoping it’s just a bug that will be fixed later. Not sure if I tried the camera but I know the Mic works because I tried Cortana voice search a bit.

    Haven’t tried any 3 or 4 finger swipes but it seems to work with 1 finger although it’s still easy to brush it while typing which I’ve been used to with Win7. I feel like the battery doesn’t last quite as long but I also just had the DC power jack replaced and ended up needing a new charger too (long story) so there are too many variables there for me to give a real comparison.

    Sorry I can’t give a more complete review but I’m basically using it as just a web browsing machine with occasional productivity work and it works there.

  38. Hey Jure, I have some questions after still reading after post on this blog. (I’m kind of a noob)

    1) When you installed the transcend ssd on your GF’s ux31a, did you still have to do any insulation taping/anti-static filming? Basically, I’m trying to avoid this because I’m worried I won’t know how to do it. I just want to replace my ssd using an adaptor and new ssd, that’s all.

    2) Which ssd do you recommend when I replace?

    3) Which adaptor is best? Will this be fine for example? http://www.amazon.com/ZTC-Thunder-Replacement-Zenbook-ZTC-AD003/dp/B00WH7U0TA/ref=sr_1_3?ie=UTF8&qid=1434240201&sr=8-3&keywords=m.2+ngff+ux31

    4) How do the shorter ones compare with those longer ssd’s (like your GF has a short ssd but you have a longer ssd on yours) ?

    5) Any tips when I do this process? I’m about to buy an adaptor and ssd soon, but not sure which one.

    Basically, at the end of the day, I’m trying to avoid the insulation and that stuff. Is there anyway where I just install the ssd and adaptor, or would I have to go through insulating.

    Thanks!! let me know asap when you have time

    1. 1. Of course I insulated also on GF’s, and also yesterday when I helped a coworker to change disk on his UX31A. It is not hard. Take some plastics (like plastic bag in which disk comes) and tape it on the inside of the cover where disk could touch. I usually used special electrical insulating tape, last time we didn’t have it, therefore we used normal office tape. See image above in blog (if you need more guidance, I can post more photos).

      2. Depends of size. I’d stick to more known brands as corsair, etc.

      3. This adapter should be ok.

      4. Normal user won’t see difference. Smaller usually have more storage per chip, that probably results in more heat generated per volume and problems in dissipating, but I think that will not be noticeable.

      5. I am afraid I don’t have any other tips, if I get any I always update this post. It’s really simple procedure 🙂

    1. Huh, difficult question. I would assume that controller must be on the disk itself – because it supports M.2 connectivity (the disk, not the UX31A).

      If disk was connected through normal M.2 connection I’d say that there is no disk controller on the motherboard, but because this is proprietary adapter I would assume that there is SATA disk controller on the motherboard. This could be reason why disk must support SATA interface.

      1. I can read data from old SSD, but can’t write, did not orderd a new one to replace the SSD yet

  39. If you can read, make backup as soon as possible. I assume that you won’t be able to read data for long.
    I hope that if you replace the disk everything starts working.

    1. Connected it via Asus Connetor->Sata->USB adapter and i see partitions as RAW but can’t recover them si i assume is the SSD not the motherboard

      1. That probably means that disk is dead. You should try to replace it by the procedure above if you want to continue to use the laptop.

  40. Thanks for the manual! It worked absolutely great for me.
    I used “M-ware® Adapter NGFF M.2 HDD zu XM11 . Zenbook UX21 UX31 UX51 ID14822” and “Transcend MTS800 M.2 SSD 128GB SATA III” for my Zenbook UX31a.
    Actually running Ubuntu 14.04 with no flaws.

  41. Asus UX31 Touch from 128gb SSD to Samsung 500 GB Evo SSD in 30 mins. Put the Samsung in a StarTech M2 Enclosure. Use Samsung Data Migration (I had a copy but you can get it online- works only with a new Samsung SSD) to Clone C drive to M2 via USB 3. Change the drive as per procedure above. On replacing the back, tighten screws as you would a car wheel to ensure even pressure all round. Fire it up – Great: No problems at all. Many thanks as without the help and advise on this blog I would probably not have tried it.

  42. Hello. Firstly, I have to say this website is fantastic. I have learned heaps – and will hopefully be able to revive my Asus UX31A

    I am looking for opinions on which replacement SSD drive to put into my Asus UX31a. I have the adaptor. Now debating whether to get the Transcend TS256GMTS800 M.2 SSD – or the Samsung 850 Evo model MZ-75E250. I understand that the Samsung may be faster and has a longer warranty. However, it sounds like some people have had trouble fitting the Samsung into the ASUS and getting the back cover to close properly. But I have not heard any problems from people fitting the Transcend. Opinions and advice would be appreciated. Thank you.

    1. I would go for samsung – seems bbmetter and has better reputation as brand. I think only 1 user mentioed problems with fitting if we dont cout the guy hwo pit wrong screws in.

  43. Samsung EVO 250 Gb worked for me with this adapter. It’s like a new computer again compared to running Ubuntu off a thumb drive. Thanks for a great guide!

    1. Thanks Jure and Niklas for your comments. I will go with the Samsung – and hopefully it will work out.

  44. Hi,

    I have bought my ux31A in japan 3 years ago and it seems my ssd won t work anymore, i have read your comments but it s a little confusing, the adapter, is it out of stock? which SSD is better for 512 Gb to replace my old one? Can i back my data from my original ssd ?

    Thanks in advance for your answer

    1. Well, read the comments; you will find links to plenty of adapters. Select similar as I did. Which disk is personal decision. I prefer “well known” brands as samsung, corsair, etc. If your disk stopped working I think that there is no simple way to recover data. (It’s almost impossible).

      1. I bought everything and tried to change my ssd but the screw on my original ssd is dead. Anyone know how to unscrew this kind of situation ?

        Thanks in advance

  45. Hello and thank you for making this blog!

    I want to confirm that by using this adapter (http://www.ebay.com/itm/321484120903?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT) and the Samsung 850 EVO M.2 250GB worked as a charm.
    I also used anti-static material under the lid.

    I’m one of the lucky ones that has Dreamspark available since I’m a student, and I installed a fresh copy of Windows 8.1 with no problems (Avoiding the bloatware from asus).

    Now it’s time to find all the drivers!

    Thanks for a super guide 🙂

  46. Hi,
    @Jure can you tell me what is the size of your adapter?
    how LxWxH.
    Thenks you!

    1. Sry I have been away for 14 days, I will open up my UX31 later today and post measurements.

    2. I opened my PC and measured:

      length: 90 mm (without the connector part, connector is about 3-5mm)
      width: 24 mm
      height: top side of the disk is about 7-8 mm above motherboard (hard to measure). If you are interested only in height of the adapter it is normal PCB thickness and connector that is about 3 mm

  47. Hi everyone,
    I desperately need your help!
    I bought a ux31a with a corrupted bios, so I replaced the chip with one that had the bios intact. In that process I accidentally desoldered the tiny condensator right below it and lost it.
    Can someone of you please measure the capacity of the condensator and let me know? I have no own pictures of it because mine is gone so I marked its position on this picture: https://www.dropbox.com/s/bhiz8xng2ms4zf5/ux31a_condensator_value_needed.jpg?dl=0

    Please it’s urgent! Or at least maybe take a close picture of your condensator if you can and show me.
    Thank you!
    I didn’t know where else to ask this in order for people to actually see it..

    1. Hi, sorry for late reply. I will try although my multimeter has some problems with measuring capacitance. How accurate is in circuit capacitance measuring with “normal” multimeter anyways?

  48. Hi everyone,

    my SSD also died, actually a second time, since it was replaced already. ASUS gives a rediculous warranty of 3 months on repair parts and the warranty for my laptop ran out already. In total it is the 3rd necessary repair. The quality is really not what should be, I would probably have thrown it out of the window if it wouldn’t be so great once it is working. Anyway just sending it in and getting it checked, without any repairs would be charged 90 Euros …
    So I came across this great site and figured, I’ll do it myself:
    I got the M-ware® Adapter NGFF M.2 HDD to XM11 for Zenbook Adapter directly from M-ware.de for 23 Euros incl. postage. As SSD I bought the Samsung SSD 850 EVO (Basic) Series M.2. As descibed I isolated the interior, but only with insulation tape no extra plastic.
    It immediately worked like a charm, a little bit tight, as mentioned, but no big deal. And space is also upgraded.
    Many thanks for providing the infos here – really great!!

    On a side note: My Fn-shortcuts don’t work after a while, I already updated the drivers, seems to have something to do with closing and reopening the lid. Fn-keys only work again, when I restart the comp. Anybody had a similar problm and solution??


    1. Hi, first time I hear about FN keys problem. Did you install fresh copy of Windows? Is it possible that it is drivers issues if you did fresh install?

    2. Try LiveUSB with Fedora 21/22 x64 and try to modify you keyboard light. If it will work is a driver issue under windows. What version of Windows do you have?

    1. I bought this one and the transcendent (above). It works perfectly but it touches the back cover so you will have to isolate the cover with antistatic plastic. Please look above, Jure wrote about this.

      Writing from my UX31A
      Good Luck!

  49. SSD disk Crucial 500GB MX200 dela brez problemov v Asus-u UX31A. Oznaka diska Crucial MX200 500GB SATA M.2 2280SS SSD – CT500MX200SSD4

    LP, Mihael

    SSD Crucial 500GB MX200 works without any problems in the ASUS UX31A. SSD disk has a label Crucial MX200 500GB SATA SSD M.2 2280SS – CT500MX200SSD4

    Tested 14.07.2015

    Best regards,

    1. Hi Mihael,

      Could you please post some picture hot it looks like the SSD installed and did u used this adapter
      M-ware® – Adattatore NGFF M.2 HDD/XM11 per Zenbook UX21 UX31 UX51 ID14822 https://www.amazon.it/dp/B00NN4HESQ/ref=cm_sw_r_awd_J7mQvb4GGHHJ0
      Crucial CT250MX200SSD4 – MX200 250GB M.2 2280SS SSD SATA 6Gbps Solid State Drive (CT250MX200SSD4) https://www.amazon.it/dp/B00TY171Q2/ref=cm_sw_r_awd_j9mQvbJ9KVX7F

  50. Thanks for all the great info. I am having a ux31a 128gb ssd, will certainly think about uograding.

    Btw, anyone hv any idea whether the ux31a sd sdxc slot can support 128gb sd memory?

    1. Sry, I dont have such big SD cards to test :S. Anyway, read and write speeds will be very slow in comparison to ssd.

  51. (1) Hardware.

    This is to confirm that my UX31A-DB51 (originally with ADATA XM11 128Gb) seems to have well digested the following replacement:
    – Transcend MT800 512 Gb (TS512GMTS800), eBay item #251865698816; and
    – the 18pin-to-M.2 adapter “NGFF M.2 B KEY SATA SSD to Mini PCi-e mSATA 18 Pin Adapter card 22x30mm 22x42m 22x60mm 22x80mm for Asus UX31 UX21 Zenbook” (US Amazon ASIN#B00T608JZS).

    The Transcend disk coupled with the adapter is a few mm ticker than the original ADATA disk. I added on top of it the original insulation tape (detached it from the top of the original ADATA disk). Yet, the back cover of the laptop seems to be attached firmly and I feel no extreme hot at the bottom of the laptop).

    I will post pictures — Jure, please guide me how to do this in this thread.

    (2) Migration.

    I am a layman with UEFI and migration generally. Have googled and read a lot in last 3 days, bought and tried a few migration products (including those which have been suggested here) in sequence–it wasn’t easy for me. What finally saved me is Paragon Disk Copy 15 Professional alone. It took me long hours to understand how to successfully migrate, with Paragon in particular–given that my original ADATA disk had a number of bad sectors and any sector-by-sector cloning never worked, and given my complete ignorance of the UEFI requirements once I made a successful clone.

    I’ll write my experience later–again, Jure, will need your guidance as to how to post pictures here.

    (3) Questions. A few questions remain:

    – Paragon finally cloned all the partitions of the original ADATA disk for me but not the 10Gb RECOVERY partition 4 alone. I’d like to have it just in case (it’s knowingly workable as I could have loaded to the recovery with the original ADATA disk installed)–any suggestions how to migrate it?

    – I understand that the original ADATA disk’s 4Gb partition 3 is probably the SSD provisioning partition. If so, I don’t need it on the new Transcend disk (or am I wrong)?

    Thanks in advance for answers and I will more of my experience later (maybe only in 1-2 weeks time, but if you need urgent assistance, just reply to this post, I’ll keep on monitoring this thread when I only can).

    Last but not least, all my thanks are going to Jure and other authors in this thread–this is what helped me to identify the new hardware to buy and (humbly) to introduce me to the idea of migrating the OS/data without the need to reinstall/copy anything!

    1. Hi,

      Brilliant thread on here, please all keep up the good work!

      I’m just looking at carrying out this procedure on my UX31E, with the NGFF adapter card and Samsung 250GB SSD.

      To prepare I used Macrium Reflect Free version 6 as I’ve used Macrium for this sort of disk migration before. Macrium will image both the C and recovery partitions and burn you a bootable DVD set (or bootable USB stick) with Win PE operating system and the backup of the disk you created on it.

      You can simply change the boot order in the BIOS of the UX31 (hold down f2 while it’s booting and go to boot options) to boot from an attached USB DVD drive or the USB stick and restore the image to the new disk. Then you’ll probably want to move and change partition sizes, which you can do with Easus MiniTool Partition Wizard (free again)
      I’ve created a bootable USB stick and checked that it works so when the bits arrive I think I’m good to go and will post results here.

      I suspect at the end of it all you’d also want to re-optimise the contents of the SSD for maximum performance , Samsung provide their Drive Magician Tool which does this. Do Transcend supply a similar tool?

      I must say in researching the alternative drives available it’s all pretty confusing, starting with Transcend and others saying their drives operate on 3.3V and Samsung saying theirs operate on 5V !

      Transcend/Crucial and others also claim thicknesses between 3.5 and 3.85mm and Samsung quote .06 inches..which is about 1.25mm..I think not. Ah well, thanks to this forum at least you know from others experience what will work.

      Incidentally as the battery capacity is now quite a bit lower than when it was new I’m also looking at fitting a replacement battery and have found a UK source for an OEM one at ~£45. Has anyone carried out this procedure? Any problems?

      1. Hi,
        last year I was still student so I was thinking about replacing the battery, but this year I started to work and I don’t need to carry UX31A from classroom to classroom and I also have outlet at my desk therefore I didn’t perform battery replacement. Therefore, I don’t have any experience. Only thing I know is – here in Slovenia I contacted official service where they told me, that new battery would cost me around 110€. (They would perform upgrade).
        Thank you for your post, I will look into Macrium Reflect Free, I don’t know this tool but it seems promising.

        1. Hi Jure,

          Thanks for the reply. Looking at the battery screws/connection it seems pretty simple so given that the HD upgrade goes OK I think for £45 I’ll change the battery as well.

          Interestingly I was looking at power consumption figures for all the drives mentioned as you wouldn’t really want to lower battery life much (or increase heat noticeably) but manufacturers generally seem quite coy about read/write power consumption..I suppose there are a lot of variables.

          What I could find out was that the quoted idle state power consumption, and indeed real-world test results, of the 850 Evo were at least half that of almost any alternative I could see which bodes well for battery life, most notebook ops for me being working on a spreadsheet, reading mail, web pages etc where idle state kicks in quite a lot. Peak power on writes seems actually higher than the Transcend and Crucial.

          The original drive being a pretty old design I would have thought that actually almost any current generation drive would be a lot more efficient.

          We’ll see whether reality matches up to theory and thanks again for such a useful blog.

        2. Hi Jure,

          Well, I carried out the upgrade to a Samsung 256GB M2 850 Evo SSD and all worked just fine. Macrium Reflect, and the Win PE 64 boot USB created with it, restored the original partitions just fine and I now have a rather fast new SSD!

          Reflect actually recognises an SSD as the target to restore to and apparently carries out the necessary sector alignment for optimal SSD operation without you having to mess around doing anything special afterwards..except for re-sizing the partition to use the new increased disk space of course.

          Perhaps more importantly Reflect also restores the hidden ‘System Restore’ partition too, so you can use that to create rescue disks in the future…something that Samsung’s Data Migration Tool doesn’t do (don’t know whether Paragon or other migration tools do this?)

          Anyway..all working very well now, the Samsung is way quicker than the original Adata, sequential write speed having tripled and random read speed doubled.. Nice!

    2. ” Paragon finally cloned all the partitions of the original ADATA disk for me but not the 10Gb RECOVERY partition 4 alone. I’d like to have it just in case (it’s knowingly workable as I could have loaded to the recovery with the original ADATA disk installed)–any suggestions how to migrate it?”

      Yes, jut use Macrium Reflect Free to back up the old disk and it will create a Win PE boot USB/DVD and backup file that will restore both the main OS partition and the hidden recovery partition.

    3. Hi, sorry for late replies:

      Paragon finally cloned all the partitions of the original ADATA disk for me but not the 10Gb RECOVERY partition 4 alone. I’d like to have it just in case (it’s knowingly workable as I could have loaded to the recovery with the original ADATA disk installed)–any suggestions how to migrate it?

      I didn’t backup recovery partition, because my UX31A came with windows 7, then I bought windows 8.1 upgrade, and now I am running on Win10. Therefore I realy don’t need Win7 recovery partition.

      – I understand that the original ADATA disk’s 4Gb partition 3 is probably the SSD provisioning partition. If so, I don’t need it on the new Transcend disk (or am I wrong)?
      I think (not 100% sure) 4GB partition is for Intel’s rapid storage technology. After disk migration I didn’t install it and I don’t need 4Gb partition.

  52. Super instructions, thx so much

    I want to upgrade my Ux31A and Ux31E with the 515Gb.

    Just checking, is there a way to use the old SSD in my old laptop to replace the 2,5″ Sata disk. Plenty of room for adapters, but i guess its difficult to find an adapter for this….

      1. Cool, will try to find that adapter because the one on the german amazon is out of stock. I installed a new Transcend 512 GB TS512GMTS800 in my UX31A and super happy with this.

        Will try the other adapter to play in an old laptop, no worries for the data because nothing important will be on that one.

  53. I believe no such experiment has yet been done with the UX21E.

    I will give it a try with the Sintech adapter and the Transcend 256 GB SATA III 6GB/S MTS400 42mm M.2 SSD (TS256GMTS400), then report back here with the results.

    ℳ∂Ʋς ℐℳ ℋ∂Ʋς ♈,,⊃~~

  54. Thanks a lot for this webpage, I have resurrected Asus UX31E. I have succesfully installed SAMSUNG 850 EVO 500GB (MZ-N5E500BW). I have also used some insulation material to separate it electrically from the chassis. The SSD installed inside adapter (sintech) sticks out a bit compared to the battery, but I haven’t observed any problems with fitting nor assembling the chassis. Now laptop works much better than expected.

  55. Hi Folks,
    i have installed & tested on my UX31A:

    Crucial Technology CT250MX200SSD4 HardDisk
    M-ware® Adapter NGFF M.2 HDD to XM11 for Zenbook UX21 UX31 UX31A

    Everything is working good and smooth.

    Thanks Jure for this wonderful guide


  56. Hi folks
    thanks alot to the author of this post. I had given up all my hopes when ssd was crashed and asus customer care gave mean estimate of 370 usd for fixing ux31a with 128 ssd.
    I waz totally gave up and decided to buanotber brand new laptop. For tbe past few months, asus laptop was put aside.

    After reading this blog , i decided to repair and i ordered transcend m2 ssd 256 gb for 105 usd,and m2 adapter from ebay for 10 usd. I was able to fix my ux31a with help of this blog and installed Windows 8.1 successfully with out getting any prompt for product key. Later upgraded to window 10 home.

    thanks alot to author.

  57. Hi all,

    Thanks. I just did the upgrade with:
    – NGFF SSD adapter as sandisk sd5se2/SDSA5JK ADATA XM11 for Asus Zenbook UX31 UX21 from eBay.
    – Samsung EVO m.2 120gb ssd from MSY in Victoria, Australia.

    No problems at all!

    One thing to note with the T5 torn screw is there is a T5 and T5h. The T5h has a hollow section at the centre. Both of these will work on the Asus back cover screws.


  58. Thanks Jure for this wonderful description/site and thanks Stefan for your bios instructions which saved my life. I used Samsung 850 EVO 500 GB M.2 3.5-Inch SSD (MZ-N5E500BW) and Sintech NGFF M.2 BM Key SSD to 18Pin Adapter Card for Replace Sandisk SD5se2/SDSA5JK ADATA XM11 SSD of Asus Zenbook UX31 UX21 from Amazon. I used gparted as I cloned it to usb then to new ssd again.

    Thank you for your help.

    1. Mr Kaan, could you please kindly share the links/pictures of the adapter?

      And is this harddisk still working well?

      Best wishes,

  59. Hi,
    Thanks for the hints.
    I had some problems due to an apparently corrupted SSD (SanDisk SDSA5JK-128G).
    What worked best for me was use ddrescue (which I had used before on currupted disks), after which I used GParted to move and resize the NTFS filesystem.
    1) booted with SystemRescueCd
    2) I attached an external disk through usb to store the intermediate image.
    3) save the MBR with dd
    4) save the ntfs filesystem to an image file with ddrecue (3 runs)
    5) save the windows recovery partition
    6) replace the ssd with a new one (Samsung SSD 850 EVO M2 inserted in an Adapter NGFF M.2 from china (7 euros).
    7) dd back the MBR
    8) dd-ed back the saved ntfs filesystem and the windows recovery partition
    9) booted and check the filesystem fine
    10) rebooted with SystemRescueCd and moved & resized the filesystems
    11) rebooted windows, voila!
    More speed no hickups anymore (apperently due to the corrupted SSD).

  60. So I read a lot of feedback abve and I am still not sure I understand. I have UX31A and I have Samsung EVO 500GB mSATA. So you are saying that the port ASUS uses is some weird proprietary port and it is neither M2 nor mSATA. But the adapters you are discussing above are M2 adapters. So there is no way to use mSATA drives with this laptop?

        1. This might work. If you test it, please report back and I will update original post for the others UX31 owners.

  61. Hi:

    I’ve just upgraded the SSD on my Asus UX31a following your steps. I’ve used the M-ware Adapter NGFF M.2 HDD zu XM11 . Zenbook UX21 UX31 UX51 ID14822 and a Samsung 500GB 850 EVO M.2 SSD.
    It took less than 10 minutes and all is good.
    The gain in speed is marginal (I had the ADATA XM11 256GB-V2) but twice the disk space is very welcomed.

  62. Thank you for the article, it inspired me to upgrade the SSD in my ux31a.

    I used the Samung Evo 850 m.2 500GB, together with this adapter:

    This adapter layout solves the issue with the tight fit (increased thickness) most other adapters have, but will only work with 2280 cards if you want to use the original ssd fixing point at the rear.

    1. Fantastic find. This adapter is the most elegant solution I’ve seen. Just as you stated a 2280 card will fit perfectly- I’m talking an absolutely perfect fit. Extremely impressed. I used a Transcend 256GB (TS256GMTS800) card. Since the fit is identical to the existing card, one thing I found useful was to peel the insulation from the existing AData card and stick it on the new Transcend card to protect from any discharge to the metallic casing. Fit perfectly.

      Thanks so much!

    2. Many thanks for the tips on this page. This adapter works great for the Zenbook UX51VZ (also called U500V) as well. I just changed both SSD:s on mine combining two of these small adapters with one Samsung 850 EVO 250 GB and one Crucial MX300 1TB, both 2280 cards with SATA connections.

  63. Great forum, for those little ASUS ultrabooks and their SSD problems. I got from my client ASUS UX21, and after three time read all forum lines, decided to buy those things for replace old and bad and almost DEAD sandisk SSD:

    M-ware® Adapter NGFF M.2 HDD zu XM11 für Zenbook UX21 UX31 UX51 ID14822
    ASP900NS38-256GM-C (SSD Adata Premier Pro SP900 256GB M.2 2280 SATA 6Gb/s (read/write;550/530MB/s))

    And confirming, that everything works smoothly, so I think for the UX31 will be the same 😉 Back cover wasn’t closing smoothly, but there was no problems to brake it somehow. Just put all screws, and closed it for good I think now 🙂 Good luck for everyone if wants to change to Adata SSD, I just love them, and there are not much of RMA with them, and for a good price I got it. So if anyone can, please, EDIT at the beginning of this forum about working Adata SSD. Thanks !!!

  64. Hello from Norway. Great page! Have stuggled with this superslow Sandisk 128gb SSD inside my Zeenbok ux31a for 2,5 years now.

    Just ordered this adapter to my Zenbook ux31a: http://www.ebay.com/itm/321843326589

    and the Samung Evo 850 m.2 500GB SSD:

    Is there a USB Housing Case on ebay to fit the Sandisk 128gb from the Zenbook? If so, wish one? I would be great help if someone could reply this. I dont want to order the wrong one.

    Thanks in advance

    1. I don’t know any usb housing. I have seen adapters that would change disk’s interface to sata (like there are in my original post). Then you can find SATA < -> USB adapters and housings – just make sure it will fit in the USB housing.

  65. super happy with the 512gb ssd in my ux31a and tho old laptop flies with the old ssd from the asus.

    now, a bit off topic, looking for a 802.11ac wifi replacement.

    anybody a sugguestion?

          1. I don’t think these ssd adapters will work. I have never looked at these wifi adapters but are you sure that connector is not standard? And wouldn’t you have to change antennas also for the ac or it would work with built in?
            Well I checked and it seems that you don’t have to do that: http://www.cnet.com/how-to/how-to-upgrade-your-laptops-wi-fi-card/
            Did you do any research on white listing mentioned in that link?

  66. Hi, the problem in the antenna connector is the same as described here http://goo.gl/LC2gnp . I just opened my ux31a again to see that this adapter + NGFF card will not fit in our ux31a. There is no room on that side.

    But, on the same forum i found another solution. With these http://goo.gl/9NyLD7 you could fit a ‘normal’ mini pcie card.

  67. Hi,

    I recently installed the transcend 512gb harddrive that has been mentioned above with this adapter :


    However it is only showing up 220gb of storage space, which is strange as it is a 512gb ssd.

    Also, it is only showing a C drive, no other drives, which is an issue as my backup was run on a C drive and D drive partition.

    Any thoughts or solutions are more than welcome. Thanks!

    1. Great to hear. Using anti static band is good practice. For all who read comments, don’t forget to at least discharge yourself by touching “good” earth point and ground point of the thing you are working on when messing with electronics.

  68. Great post.
    I was unfortunate enough to have the original Adata 128GB fried right after the laptop warranty expired. Then I ordered a replacement through official Asus partner, paid big $$$ for it (over 220USD for the same Adata 128GB), and of course it died after only 6 months. Complained to Asus, but they said that the replacement part has only 3 months warranty?!?

    That brought me here, I bought these two things and solved my problem, hopefully Samsung did a better job than AData:
    short M.2 adapter: http://www.ebay.com/itm/321843326589
    Disk: http://www.amazon.com/Samsung-850-EVO-250-MZ-N5E250BW/dp/B00TGIVZTW

    I have applied thermal pad from the original Adata disk to this Samsung in order to improve cooling.

  69. The RAM bottleneck will always persist due to the fact that the memory is soldered – right?
    I really love the Zenbook but the RAM issue is terrible for me.

  70. Hi Jure,

    my Sandisk U100 256GB SSD also died on me today :-/
    I just browsed my CDs and found 2 CDs labeled Asus System Backup which I aparently have created when I bought the UX31E. Do you happen to know what kind of data it contains / backups ? I ordered the M.2 adapter and a new SSD. Do I only need these Backup CDs or a Windows DVD too to reinstall Windows?


    1. I think those two CDs that windows prompted you to create at first boot are enough. I think you won’t be needing any windows DVDs. That said, you will go back to original windows 7, and not to Win8 or Win10 if you upgraded.

      1. Hi again,

        as promised here’s my report: Thanks to your great guide I managed to replace my damaged Sandisk U100 with the Transcend MTS400 M.2 SSD 256GB SATA III, MLC (Performance test in comparison with yours: http://i.imgur.com/GaGnnH5.png).

        I bought this adapter : Adapterplatine M.2 / NGFF-SSD > XM11 für Asus Zenbook UX21 UX31 UX51 Konverter (18€ shipping included) to make the Transcend MTS400 work in my UX31E: http://www.ebay.de/itm/361421480375

        To rescue my data from the damaged Sandisk U100 I bought these two adapters off Amazon:
        M-ware® Adapter XM11 SDSA5JK SSD 8+18p/6+12p zu SATA HDD ID14941 (http://www.amazon.de/gp/product/B00OLB8IXA — you may get it even cheaper from m-ware.de directly) + Anker USB 3.0 auf SATA Adapter (http://www.amazon.de/gp/product/B014OUSZ8K)

        The installation of Windows 7 was more tricky:

        Unfortunately the 2 Asus System Backup CDs didn’t work for me getting Error Code : 1029 as reported in this topic too: https://rog.asus.com/forum/showthread.php?4995-Failed-in-the-recovery-DVD-s
        Not sure why. I then tried to install Windows 7 on the Transcend SSD from a DVD but always got errors, Windows installation telling me that it can’t install this or format that or copy this etc. Reallyfrustrating, making me think that I somehow received a faulty new SSD for I tried 3 different WIndows 7 DVDs.

        I then read somewhere that I should create a bootable Windows USB stick. After getting a step further in the installation process, the installation got stuck after 3% while Windows was copying some files. Being sick of it all I replaced the USB 2 stick with a brand new USB 3.0 stick and made it bootable with Windows 7. Aaaaand….now it finally worked! No (real) problems after that. Installed all drivers from the Asus website and everything’s working fine, and much faster than before 🙂

  71. Hi
    After I’ve upgrade my hdd to a Samsung 850 EVO MZ-M5E500BW 500GB mSATA SATA-600, the asus has gone crazy… I have tick several times on any options before it stops and open, for exe to open a folder.. keeps opening and closing until after 10 times it stops and opens, on the web browser it’s the same thing… I can’t do anything unless I click several times…. it seems that the computer is faster (or slower) than the cursor… Any ideas why it’s doing this? I have win 10 installed but it was working perfectly with it before with old 128Gb ssd drive…
    It’s driving me crazy 🙁

    1. Wow, no idea. But I have some ideas how you can pinpoint origin of the troubles. I dont know how good you are with the computers, but first things I would try:
      – live boot linux from usb – If everything works as expected here, than touch pad and other hardware (motherboard) is ok,
      – install linux (run it form disk) – so you will see if everything is ok also with the new disk

      If everything up until now worked it means that everything is ok hardware wise, that its software issue with windows… then would I reinstall windows, touchpad drivers, … etc.

  72. Hi Jure,
    thanks for this very helpful page.

    I replaced the original SanDisk U100 128GB now with a Samsung SSD 850 EVO 500GB, M.2 6Gb/s (MZ-N5E500BW) and this short adapter (http://www.aliexpress.com/item/128G-256G-512G-M-2-NGFF-SSD-Adapter-replace-SDSA5JK-128G-SDSA5JK-256G-SD5SE2-XM11-for/32449335586.html) to avoid problems with the case.
    After installing of Windows 7 I performed immediately a drive test with CrystalDiskMark 5.0.3 the performance is unbeatable now to compare it with the old SanDisk U100 128GB.
    Here are the results :
    OS : Windows 7 Home Premium SP1 [6.1 Build 7601] (x64)
    Sequential Read (Q= 32,T= 1) : 551.823 MB/s
    Sequential Write (Q= 32,T= 1) : 533.573 MB/s
    Random Read 4KiB (Q= 32,T= 1) : 201.889 MB/s [ 49289.3 IOPS]
    Random Write 4KiB (Q= 32,T= 1) : 203.046 MB/s [ 49571.8 IOPS]
    Sequential Read (T= 1) : 507.532 MB/s
    Sequential Write (T= 1) : 494.327 MB/s
    Random Read 4KiB (Q= 1,T= 1) : 30.935 MB/s [ 7552.5 IOPS]
    Random Write 4KiB (Q= 1,T= 1) : 44.122 MB/s [ 10772.0 IOPS]

    Thereafter I installed the Samsung Rapid Mode (Real Time Acceleration Processing of I/O Date Mode) with the Samsung Magican 4.9 Tool. The results with CrystalDiskMark are now as following:
    OS : Windows 7 Home Premium SP1 [6.1 Build 7601] (x64)
    Sequential Read (Q= 32,T= 1) : 3277.372 MB/s
    Sequential Write (Q= 32,T= 1) : 2957.718 MB/s
    Random Read 4KiB (Q= 32,T= 1) : 555.130 MB/s [135529.8 IOPS]
    Random Write 4KiB (Q= 32,T= 1) : 225.147 MB/s [ 54967.5 IOPS]
    Sequential Read (T= 1) : 1371.956 MB/s
    Sequential Write (T= 1) : 2057.513 MB/s
    Random Read 4KiB (Q= 1,T= 1) : 150.519 MB/s [ 36747.8 IOPS]
    Random Write 4KiB (Q= 1,T= 1) : 173.479 MB/s [ 42353.3 IOPS]

    The RapidMode is speeding up the Read/Write perfomance again on a higher level :).

    Finally I can say the replacement of the SSD was a big sucess.
    Small investment to have now a high performant SSD in my Zenbook.

    best regards

      1. It’s a pity that ASUS was using such non-perfomant SSD in the Zenbook UX-31A. Lucky they who got the Ultrabook with the ADATA SSD (better than the SansDisk SSD) in this time .
        Now I am very satisfited with the general performace and it makes great fun to use it anywhere :).

  73. I have the same issue with my UX-31A as well; the original SanDisk U100 that came with the Zenbook didn’t exactly die. There were several times that the SSD was not detected (it just boot straight to BIOS) when I restarted or switched on the laptop after switching it off prior to that. However, after a few times of forced shutdown (pressing and holding the power button) to turn it off and switching it back on, the SSD came back to life and everything went normal.

    Thinking that my SSD had faced the same issue as many of you over here, I bought a Samsung EVO 850, 250GB and the short adapter. I also bought the M2 SSD enclosure from Star Tech to connect to the laptop via USB 3.0.

    I ran the Samsung Data Migration software and cloned the old SSD to the Samsung SSD, with the old SSD still in the ultrabook and the Samsung SSD connected via USB 3.0. Following the instructions, I installed the new Samsung SSD into the ultrabook. The same problem of booting directly into BIOS still persist.

    Is there any other way I can get around this? If not, is there a way to clean install a new OS and boot directly from USB (by running the new SSD via the Star Tech M2. enclosure)?

    Thanks to the author and many of the commentators who contributed to this site! I learnt a lot from here!

    1. I am quite occupied this week, please if I forget remind me next week to look a bit into your problem.

        1. Hi,

          sorry for late reply. If I were you I would firstly try to figure out how stable is my sistem. Meaning I would install linux system on USB drive and boot from it. From there I would run some stress testing utilities. (search for google, I am sure you will find multiple tutorials when looking for: “How to create a bootable USB ubuntu” and “Ubuntu stress testing utility”). If pc would run as expected under heavy load and stress test that means that most of the components are OK. The things not checked are: disk and disk controller. If all the components would pass I’d install ubuntu to the new hard drive. If PC would be stable and running fine under newly installed OS its problem with the image of the OS you are copying to the drive. How to get “clean” image of the OS (I presume its windows) depends on what version of the Win do you have? Are you still on Win7, or you bought upgrade to Win8/8.1? Have you upgraded to Win10?

          If you bought short adapter please also consider EDIT 12 in the original post (my response to the Sarah comment: https://jure.tuta.si/?p=98#comment-529 )

  74. Thanks for this very useful page.

    I ordered the “Samsung MZ-N5E250BW 850 EVO 250GB”

    and “Adapterplatine M.2 / NGFF-SSD”

    Works as expected and fits just fine.

    CrystalDiskManager 5.03 x64 Logs:
    Sequential Read (Q= 32,T= 1) : 538.891 MB/s
    Sequential Write (Q= 32,T= 1) : 506.000 MB/s
    Random Read 4KiB (Q= 32,T= 1) : 358.719 MB/s [ 87577.9 IOPS]
    Random Write 4KiB (Q= 32,T= 1) : 294.947 MB/s [ 72008.5 IOPS]
    Sequential Read (T= 1) : 497.282 MB/s
    Sequential Write (T= 1) : 491.853 MB/s
    Random Read 4KiB (Q= 1,T= 1) : 27.918 MB/s [ 6815.9 IOPS]
    Random Write 4KiB (Q= 1,T= 1) : 50.374 MB/s [ 12298.3 IOPS]

    Test : 1024 MiB [C: 14.6% (34.0/232.8 GiB)] (x5) [Interval=5 sec]

    Windows 7 can only be installed by cloning (used Acronis for this), the usual procedure like using USB- or CD-drive doesn’t work.
    This issue is not for Linux Mint.

    1. Hello,
      I had no problem to install Win7 from my DVD-Drive connected to the USB-Port. Just ha to change the boot priority to the DVD-Drive in BIOS Setup and it works fine.

      1. Hello,

        Perhaps it’s the adapter. As i can see in your post above u used an other model.
        The error message says: “A required CD/DVD driver is missing…”
        I used this CD/DVD drive and the CD for about 30 PCs before and one afterwards. Also tried an USB-installation, that worked on other PCs. Linux Mint works fine using the same CD/DVD drive.

        Maybe you got a better adapter 😉
        But cloning worked for me fine too.

        1. Th solution is to change the USB port once the error is encountered. Here are the steps picked up from another website.

          1- on error page click cancel, then close.

          2- go back to the welcome screen.

          3- change usb port

          4- click on install

          5- repeat step 1 to 4 till installation goes as usual.

  75. This tool can help recover product key from bios:



    Lazesoft Windows Product finder is a free Windows and Microsoft Office product key code finder and retriever. It allows you to recover your CD product key for Windows or Microsoft Office for use when you are reinstalling or repairing your Windows and Microsoft Office setups. With it, you can recover your lost key for Windows 2000, XP, 2003, Vista, 2008 or 7 and all versions of Microsoft Office.

    What’s new in the Version 1.6:

    Retrieve windows 8 product key from BIOS
    Retrieve windows 8.1 product key from BIOS
    Supports Windows 10

  76. Thank you so much for this great post and subsequent EDITs and comments from others!
    I very easily upgraded my UX31E SSD from 128GB to 500GB using a Samsung SSD 850 EVO and the “N-UX21” adapter sold on EBAY by “1-cn487” chinese vendor. Everything went like a charm. I would not have done it without this post.
    Happy New Year and my Best Wishes to you for 2016!

  77. Hello,

    my original Adata disk broke after three years of service and now I try to exchange it with a new one.

    I have problems to get the screw of the old SSD loose. I removed the warrenty sticker and try to unscrew it, but it is really tight and has only a flat head (I am sure that I used the right philips size). I fear that I slightly damage the head in the process. Did anyone had similar problems and an idea what do?

    1. Hello,

      I faced the same issue like you when my Adata failed just before christmas. The headwas completeley damaged. I used a Dremel to cut in a slot into the screw and loosed it with a slot screwdriver.
      You need to be very cautious as the space is very limitted.

      By the way, has anonye experience with recovering data from a failed Adata SSD, seems like controller failed as the SSD is not recognized anymore in BIOS?

      1. Dan, that is a great tip.

        I replaced my adata before it failed because I overgrew it. Therefore I didn’t have to rescue the data. On my wife’s (back than girlfriend’s) UX31a disk was partially dead. Fortunately I was able to get all the data from it, “sectors” with some windows-systems files were unreadable. I had backup of windows, therefore I didn’t put much effort into rescuing that disk. (Her disk wasn’t Adata, it was sandisk 128gb )

      2. Hello Dan,

        thanks for the tip. I will give it a try. My last result would be to drill open the screw, but I would really like to avoid it. Thanks again to Asus for using such a flat and cheap screw and fixing it super tight without any need. I could have been so easy…

        Regarding data recovery, my Adata is also not recognized by the BIOS anymore. Nevertheless, I tried to use Linux Live USB to have a look whether I can rescue some data. But also Linux could not find the SSD, which means that the controller is most likely broken. Unfortunately, in such a case, there is not much you can do as far as I know. Even if you exchange the controller, the new controller does not know how the old one saved the data on your disk. You could send it to recovery service and potentially they could reassemable some of the data piece by piece (would be a gigantic puzzle). However, this is major work effort and will propably cost a lot! From a recovery point of view, SSD are much worse than normal HDD…

        I would suggest to try linux live usb. Maybe you are more lucky than me.

  78. Just a quick question! Is the Samsung 950 Pro SSD m.2 series, will work also? Thank you!

    1. It should (noone has confirmed it yet) – the question about supporting sata transfer mode, not only pcie. (Usually all disks are backward compatible)

      You wont benefit massive speeds promised by product, as sata transfer rate will probably be bottle neck.

  79. Confirming another successful install of:
    1) Samsung SSD 850 EVO m.2 500GB (MZ-N5E500BW)
    2) Adapter NGFF M.2 HDD ASUS (IE: the ‘big’ version)

    It is definitely a tight fit! You will need to push down on the aluminium back cover before screwing the T5 torx screws in, otherwise risk threading the tiny screws. As the SSD is definitely touching my back plate (IE: there’s no cushioning), I am now going to be very careful not to bump or knock the bottom of my UX31A. Time will tell how robust (or fragile?) the new setup will be.

    Nonetheless – thank you Jure and co. for all your help on this blog!

  80. Thanks so much for this! The SSD in my UX31A died a long time ago, and (due to being short of time and a guide like this), I just got a replacement laptop at the time. Thanks to this post and the comments here, however, I’ve now managed to replace the broken SSD with a new Samsung 250GB EVO M.2 SATA SSD and the adapter you recommend here. I got these both from Amazon: http://www.amazon.co.uk/gp/product/B00TGIVZTW and http://www.amazon.co.uk/gp/product/B00XL7R69M

    So now that Asus UX31A is working beautifully again 🙂

    The only worry I had about doing this was that the Samsung SSD was a very tight fit in the adapter – I think it was sitting snugly at the end with the connectors, but it had to bend very slightly for the other end to fit in behind the nut thing that the fastening screw goes into. I hope that’s not going to prove to be a problem.

    Thanks again!

    1. We all had to bend it a bit jet I we didn’t get any report in the comments of it being problematic. My upgraded UX31 is running fine since December 2014 :).

      When I originally posted this I didn’t expect 220 comments. I am glad I helped so many of you.

  81. Just did the upgrade on my UX31E with the slim adapter and a 500GB Samsung 850 EVO. Thanks for all the information here, just now need to work out how I can upgrade the wireless card since that too uses a non-standard connector from what I’ve read.

  82. Just completed the install of a Samsung 850EVO (250GB) on my daughter’s UX31A with the short adapter from Ebay (see edit8 of the original post). Perfect fit ! No thickness issue and screws in perfectly.
    I did a fresh windows 7 ultimate install via USB stick. However for this to work you need to change a few bios settings otherwise you won’t see the usb stick as a bootable device and you will get the dreaded error message of missing CD/DVD driver when you start the windows installation. What I did :
    Bios setup: Disable secure boot control under header Security. Under Boot header enable Launch CSM. You also have to disable the USB3 drivers for DOS: under USB configuration- Advanced disable XHCI Pre-Boot mode.
    I created a bootable USB stick with Gparted and created one primary boot partition of about 220GB which leaves about 10%+ for overprovisioning for ssds. After that you should be fine installing W7U onto that new partition via USB stick.
    Speeds are awesome – over 500MBs reads and writes

  83. Has anyone tried doing this on a UX21E? I know the connector is the same but I am concerned about the thickness.

    1. Search through the comments, I think some users said that they will try but no-one reported any results.

  84. UX31E with adapter and plextor m6gv 256gb. No issues with thickness. For migration I used backup and restore tools from W10 and recovery usb created from the same. System image was saved on an external usb drive.

  85. Has anyone replaced the battery in the UX31E? Also what is the best option for the 512GB SSD in the UX31E.

    1. Hi,
      I have thought about it (on x UX31A). And after searching many onlne “replacement” batteries, I wrote email to the official sails representative for price quote for new original battery (that was 1 year ago). He told me, that new would cost around 100€, therefore if I would be changing it, I would go for the original – I really don’t like idea about 3rd party exploding batteries in my lap. At the end I didn’t replace, as UX31A is not my primary laptop any more.

      1. Having replaced my SSD last year, the Battery is next on my list, as it currently loses 50% of its charge just by not being switched on for 1 or 2 weeks! It also drains very quickly so I suspect it needs replacing.

        I too had previously searched and mainly 3rd party ones sent out from suppliers in the Far East! What experiences did you read about ‘exploding’ ones!?

        Now I notice amazon UK are selling one for £56.99 – looks like a 3rd party seller but I notice it says it has all ‘approvals’ – CE-/FCC-/RoHS-Certified for safety

        Think I might go for it?


        1. Sorry, you may misunderstand me. I haven’t read about exploding ones. It’s just idea about exploding batteries in phones we read on the news sites.

          Battery is quite complicated little thing. I didn’t do proper research, because I found out that price difference between original and replacement one is small…

          But from my knowledge of electronics, if “battery” contains only LiPo cells than they should be “safe” also from third parties (not saying, that they can’t false claim the capacity or durability of cells) . Bigger problem is if this “battery” also contains power/charging circuits. Those are more important – they have to provide right voltages and currents, balancing of the cells must be done correctly and last but not least thermal design must support its use – which is quite demanding in small laptop, where there is small fan, whose effect probably doesn’t propagate to the front of the enclosure, where the battery stays. Like, I said I haven’t done research where battery driver is, is it going to be replaced with Chinese engineered one, or will it stay in the laptop as it is on the motherboard.

          Please don’t forget to write here or link page where you will provide the information about the change, so we will hear about the results.

  86. Hi,
    just been looking at this myself.

    it’s not a proprietary connector – it’s an mSATA SATA3 connector.

    other than that – excellent post – I hadn’t considered down converting from M2 to mSATA… now going looking…

    1. OK. I apologise – it’s not the same. it is mSATA, but the number of connectors is different. all sorts of stupid going on there…

  87. Hi
    I recently replaced the SSD on my Asus X31e. As the new drive was thicker than the old one I took the case’s rear panel to the local auto crash centre and got them to panel beat a small dimple about 1.5 mm deep. Perfect job that the crash shop did for free. Just in case the dimple now took the weight of the machine I used self – adhesive rubber feet to lift the whole machine up a bit.

    Guess you live in Singapore. I used to work there and loved the country!

  88. We have a Asus UX31A which fails on us after three years of use. Its a big shame for such an expensive machine that there is not warranty.

    The problem is as follows and came without warning: this morning the laptop freezed while working on it. I did a hard reboot and did not think anything of it. After a few hours, the same thing happened again. This time, it did only reboot to the bios screen. We called asus, and they said probably the uthin chip is broken, and that replacing it will cost minimum €500. He said to us, that if we trying to reboot, the system may start up again. So we tried that, and indeed, it worked. However the system keeps running for a few minutes only. We try to tranfser the data to a USB stick but it goes very slow. So far for the drama.

    Now I found this website. Which sounds great! Is it as simple as I understand it? Get a adapter from ebay and plug in a SDD?
    The adapter in the main article is not for sale anymore. Can someone recommend or post a link to a adapter that will work with the Ux31a?

    thanks in advance. It’s a very nice machine and the data loss will be a pain to overcome, but it would be great if we can make this machine go for some more years.

    1. Never mind this post, I took a dive into some links and ordered an adapter (the short one), a screwdriver and a samsung 250gb SSD. Hopefully the mailman will be here soon.

  89. Hey, OP here. Yes it is that easy. Adapter changes proprietary interface to M.2. To retrieve data, you can try to plug it into some other computer that has M.2 port. (I used adapter as described in the post to connect it to sata). I managed to save all my wife’s important files, as failed sectors had some windows files on it and not her data. I used som linux tools, as are more robust in such cases.

  90. Received the adapter and a Samsung Evo 250GB card. Installing was easy. Remove the screws and then it’s plug and play. Loaded Windows 10 on a usb stick and off we went. Laptop is like new!! Briljant! Thanks a lot.

  91. Brilliant!

    One capacitor on my SSD was broken… then the SSD is still working (suprised!!!). However, I guess it will not last long so I’m looking for a replacement before it stop accidentally.

    Your post is really helpful for me. I will report the result after the replacement is done.

  92. My UX31A just died after 3 years and four months on the job. The computer boots directly to BIOS, and there does not appear to a C: for Windows to re-install to.

    I see that a lot of people are buying a SSD and an adapter for this upgrade, but many have reported that the SSD+adapter option raises the profile of the SSD, and hence, the aluminum lid deforms a bit (or just partially, if one knows where to look).

    I would like to fix my UX31A without it causing extreme physical stress on the lid. I am very afraid of buying one and ending up with unusable parts. Some of the parts recommended on this list are already out of stock.

    Can I ask someone to recommend a suitable adapter and SSD currently available on Amazon or eBay? Please help!

        1. They are all the same basically. I bought the cheapest that i could find, for 1,5 $ or so and it works.

          I am using the Crucial MX 200 500 GB. The Sandisc X400 512 GB was not working. It was recognised by Windows 7 but i could not install it.(It was Amazon Warehouse, so i can’t exclude that it was broken)

          1. edit:

            i had a big adapter but it caused the crucial ssd to freeze. I guess it was touching the backcover.(i didnt use any tape). With the small adapter i have no issues so far. Temperature is most time 55-56 degree.

          2. Hello we also tested the The Sandisc X400 512 GB in the UX31A with the same result, the ssd was not working. Windows 7 recognised the ssd but could not format it. So it is a problem of the Sandisc X400 series.

  93. Hello Jure, thanks for this article and updates.

    I have bought adapter from AliExpress and now waiting for the to arrive, will give some update after new SSD installed with the adapter.

    Here is the adapter:

    I didn’t buy any SSD yet, but seems Transcend MTS800 will be my first choice, since Samsung seems has thickness issue based on previous comments here.

    Any thought on this?

    1. My personal opinion is that there is no considerable thickness difference, I think that some commenters using Samsung thought it is bigger issue. That said, MTS800 seems great option, go for it! 🙂

  94. Just wanted to say thanks for this blog post. My UX31A was just gathering dust after the crappy U100 SSD died 1 month after warranty expired. Thanks to the info here it’s now back in business with a new Samsung Evo 850 (500GB) under the hood, and all for less than the cost of buying a 4 year old replacement POS drive through Asus.

    Just FYI, can confirm the 500GB 850 Evo is very tight indeed across the top. Had to use a single strip of duct tape on the inside of the case as insulation, but seems to work fine. Cannot screw down the two torx screws in the heat vent area, but not overly concerned.

    Overall very pleased!

  95. Hi there,

    first of all thanks for this thread.
    My UX31A ADATA SSD has just died on me, so I bought the small adapter and a Samsung EVO 250GB drive. https://jure.tuta.si/?p=40#comment-461
    Hardware installation was a breeze. However, my SSD doesn’t show in my BIOS. I tried disabling secure boot and launching CSM by pressing ESC during boot, but the SSD does not show in CSM either. Anyone have any ideas?

    1. I’d start with usual, test on another machine if disk is ok, adapter will be hard to troubleshoot, but do that if you can,…

      1. I tried the disk in my desktop today (Hell of a job; the M.2 slot is behind the motherboard…). Everything was in order. Troubleshooting the adapter will not be a possibility for me. I’m starting to think the only way forward will be using a modded BIOS.

        1. It is interesting, because this would be first case in this “thread” that modding of a BIOS is necessary. I dont think anyone else said he needed such operation…

          1. Agreed. The other option is of course to buy another, or different, adapter. I will try trhat first, since I can’t find a case similar to mine anywhere on the internet.

  96. Hi,

    I have installed a Samsung 850 EVO M.2 250GB on my UX21E notebook, with the long adapter.

    It’s working fine, and no real issue to have it fit in the computer.

    I think I’m the first one here to report a working mod with UX21E 🙂

  97. First of all, I really appreciate that you shared us a very useful info on this blog. It’s really helpful. My SSD(SanDisk) of UX31E was also broken after using 4 years. Then I bought the adapter you recommended and the intel SSD 540s m.2 2280 240G. And it works as expected. 😀

  98. Did anyone try Samsung CM871 256gb ssd with this adapter in your zenbook? I want to buy and I need a quick replay for this .

  99. Good morning,
    My Laptop UX-31E with new Win10 had the SSD failure too….sometime I can see the SSD again from the bios, but I stop using this laptop hoping in a immediate clonation to a new SSD as soon as possible.
    I’m looking to buying the new “Samsung 950 Pro” 512Gb or 1atb, same M.2 form factor for the relative NFFG Adaptor to 18-Asus-Pin (Ok). This new SSD is using the “new NVMe Driver” with really high performance
    I remember I’m using Win 10.

    Three questions:
    – Did someone tried it on UX-31E or similar?
    – Does it boot? How Did you manage the NVME Driver with Bios and Win10 Operating System in this specific laptop?
    – is everything OK with this environment?


  100. All information valid only for UX31A and UX31E models or to the whole lines UX31? I have UX31LA model and want upgrade my ssd. I don’t know which model will be support my book.
    Has anyone updated this laptop?

    1. I haven’t yet seen report of upgrading UX31LA. I would start by opening back cover and identifying what type of disk do you have in UX31LA….

  101. Hi Jure,
    One default ssd SanDisk SD6SP1M128G1102
    The board has 2 slots for ssd and from description:
    [PCH Features]
    SATA Port 3 6 Gb/s: Supported
    SATA Port 2 6 Gb/s: Supported
    SATA Ports 2 and 3: Supported
    RAID Capability: RAID0/1/5/10 + Smart Response Technology

    So as I understand it, i can setup a two disc in raid 0 mode (it’s sure?) with size 256 or 512.

    1. Hi, I don’t find any disassembly photos of UX31LA ( https://www.google.si/search?q=ux31la+disassembly&tbm=isch ). Therefore I have really little info to work with. From your post if there are two SATA ports than RAID0/1 are reasonable, but RAID5 requires at least 3 drives and RAID10 requires at least 4 and I am 99.99999% sure that this laptop does not have 3 or 4 sata ports…

      From main Asus page: https://www.asus.com/us/Notebooks/ASUS-ZenBook-UX31LA/specifications/ it really seems that it has at least two drives (bellow at notes it says : “*1 SATA3 SSD up to 512G RAID 0(optional)

      If there are two disk places in UX31LA than it seems that there is some RAID support, and my guess would be that it should support 512GB module, but as said, this is only my speculation. Probably you could also run two disks without RAID, therefore two separate drives (you gain in reliability but you don’t get performance gain from RAID if that is what you are looking for in raid)

    1. Seems there are two ssd ports, probably you can hook up 2 M2 ssds. You probably know, but anyway you do not need any adapters.

  102. They have 1 ssd slot but different type of connector, that is why users need adapter. On the image you provided it seems it is M2, but on UX31A or UX31E it is different. See the first photo in my post.

  103. Using the mini adapter mentioned in edit 11 and a crucial CT500MX200SSD4. Works perfectly. SSD does not touch the case.
    Thanks for your website!

  104. for those with the long NGFF adapter… can’t you just cut it shorter to have the new ssd fit nicely?

    doubt there is any circuitry up there by the screw mounts… and plus… the edit11 doesn’t even have those in the first place.

    so yea, i bet cutting it, to look like the edit11 adapter, should solve the clearance problem.

    1. I think you can shorten it, I dont think there is any usable trace on the board up there (except maybe GND plate), but I dont know how will you fix the disk inside laptop. Or you will just left it in there. I wouldn’t recommend that. These connectors (at least on my adapter) are made so that you have to put screw on the top – hard to explain how and what, but basically you have to “force” the end of disk towards the board, so that there is good electrical contact.

      Good alternative can be hot glue gun – to fix it inside pc. It usually does the trick.

  105. Hi Girls and Boys,

    I am running out of disk space in my Zenbook with 2.5″ SSD.

    Does anyone know if the Asus syle M.2 port can run in parralel with the big SATA – two disks in one laptop?


  106. Jure, & all who posted, so grateful for this site & all who posted. Helped me more than I can know… but I do know it was an enormous advantage. My laptop is UX31A which was originally equipped with the Sandisk memory. I bought the following adapter; http://www.ebay.com/itm/128G-256G-512G-M-2-NGFF-SSD-Adapter-card-for-Asus-UX31-UX21-TAICHI-21-TAICHI-31-/321843326589
    & Plextor memory – model # PX-512M7VG;

    The combination fit EXACTLY & performed flawlessly with zero issues on install. (~30 min including cloning)

    Used “Macrium Reflect” (free version from Macrium site) for cloning with usb adapter / enclosure;

    Thanks again to all who contributed….

  107. Hello all,
    I just upgraded my Zenbook to a 500GB Samsung 850 EVO m.2 SSD that I purchased used on eBay for $100 using the below adapter. It is working great and my cold boot to desktop is about 15 seconds…

    I would like to use my original 128GB Adata SSD as an external drive and I am looking for an external case for it. Does anyone here know where I can find one?
    The standard external cases for the m.2 2280 drives are too short to house proprietary Asus SSD.
    Thanks for all for this great thread…without it I’d still have a 128GB SSD in my Zenbook.

  108. Thank you Jure for this blog … I have a new laptop!

    My ADATA SSD started giving me problems after 3 years so it was time for a new SSD. I have successfully installed the Crucial MX300 275 GB.

    Suggested Steps:
    1. I waited patiently for my part from China. It took about 2.5 weeks. See above link for eBay purchase.
    2. Scrap off the sticker covering the Philips screw holding down the old SSD.
    3. Use the correct size Philips screw driver. Too big and you can strip it.
    4. Thank you to Stefan for the BIOS required changes. I would have never figured this out.
    5. Install Windows 10 with a bootable USB thumb drive. Apply updates
    6. Install Crucial Storage Executive Client
    7. Enable Cache Momentum

    Crystal Disk Mark 5.1.2
    Seq Q32T1 Read 1622 Write 2346

    Yes you read that correctly, 2346!

    I highly recommend this drive.

  109. Intel 540s Series SSDSCKKW480H6X1 480 Gb… good work …(работает отлично)

  110. Thanks!! I thought I was stuck with a measly 128GB in my UX21A until I found your blog.

    I ordered this adapter:

    I installed a 1TB Sandisk X400. Installation with the above adapter was super easy and it fits perfectly.
    Instead of using the ESD bag, I peeled the thick sticker pad off of the original ADATA SSD and stuck it on the new Sandisk. I think that thick sticker pad may be a thermal conduction pad to contact the outer shell.

    Here’s the crystaldisk mark report for the 1 TB x400:

    CrystalDiskMark 5.1.2 x64 (C) 2007-2016 hiyohiyo
    Crystal Dew World : http://crystalmark.info/
    * MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
    * KB = 1000 bytes, KiB = 1024 bytes

    Sequential Read (Q= 32,T= 1) : 547.366 MB/s
    Sequential Write (Q= 32,T= 1) : 478.958 MB/s
    Random Read 4KiB (Q= 32,T= 1) : 137.549 MB/s [ 33581.3 IOPS]
    Random Write 4KiB (Q= 32,T= 1) : 113.746 MB/s [ 27770.0 IOPS]
    Sequential Read (T= 1) : 473.748 MB/s
    Sequential Write (T= 1) : 465.650 MB/s
    Random Read 4KiB (Q= 1,T= 1) : 24.067 MB/s [ 5875.7 IOPS]
    Random Write 4KiB (Q= 1,T= 1) : 39.869 MB/s [ 9733.6 IOPS]

    Test : 1024 MiB [C: 3.2% (30.6/953.3 GiB)] (x5) [Interval=5 sec]
    Date : 2016/09/17 12:38:43
    OS : Windows 10 [10.0 Build 14393] (x64)
    sandisk x400

  111. Brilliant guide. I have just upgraded my 31a with a second hand ( cross fingers!) 512 Gb crucial ssd and small adapter. Worked a treat. Previous ssd was a256 sandisk, not adata?
    Loading perceptibly faster.

    A question for you experts. Tried twice to upgrade to win 10 but if failed to boot properly and got into a loop correcting faults. So gave up.

    What advise to try again.

    I love this machine!


    1. I remember having some troubles upgrading from (legally bought) Win 8/8.1 to Win 10, while on UX31A of my wife there were no problems to update form Win 7 directly to Win 10. I think I had backup of my UX31 before I installed Win 8, therefore I recovered mine to Win 7 and then upgraded to Win 10.

  112. Thanks for the guide and all the comments Jure. I don’t even know how I stumbled upon this post. Years ago I had looked into it and gave up. This saved me from buying a new laptop, at least for now. 😀

    I ordered the larger $10 adapter off Amazon (didn’t want to wait for China shipping for the smaller one) and placed a brand new SanDisk X400 512GB M.2 SATA SSD in my UX31A. After a quick clone with Macrium, back to running with 4x the capacity! I had to use GParted to rearrange the partitions to one large drive, but it’s running great without a hitch. CrystalDiskMark says it’s running about 2-3x faster in all tests compared with the stock Sandisk drive. Boot and load times are not drastic, but noticeably faster. If only I could get 8gb of RAM.

    I also had no problems closing it back up, no bulges on the back cover. The X400 is supposed to be the thinnest drive available, but I think any differences are probably negligible. Long live the UX31A, Zenbook Prime!

    1. Glad I helped. I don’t think 8 GB of RAM is possible, other than having special soldering equipment and swapping (desoldering/resoldering) RAM chips, and even for that I don’t know if it would work. Not to mention the possibility of UX31A dying while this “surgery” is going on :). Mine is unfortunately slowly dying – I have some problems with keys on the keyboard, but even if it dies today, it served me long and well :).

  113. Keep in mind that some antistatic bags are manufactured with a conductive layer of metal. These would not be ideal to place between the drive and the chassi as they will run the risk of shorting something out. I would use electrical tape instead.

    Thanks for the blog post.

  114. Hi, just wanted to thank Jure for this immensely helpful blog and all the people who shared their experience.
    My UX31a, bought in february 2013, had the Sandisk U100 which was working fine but I wanted to replace it because I needed more disk space.
    I ordered the long NGFF M.2 adapter from amazon (https://www.amazon.es/gp/product/B00XL7R69M/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1) and the Sandisk X400 SSD M.2 2280 512GB.
    Like Ryan JC said, I had no problem closing the lid, presumably because the SanDisk X400 is quite thin.
    I didn’t want to make a clean Win8.1 install so I saved an image of my whole system using Macrium Reflect in a 128Gb usb pendrive and created recovery bootable WinPE 5.0 on a separate 8Gb usb pendrive.
    After replacing the SSD and placing some electrical insulation tape where the lid contacts the SSD as instructed in this site, I booted from the WinPE and Macrium easily copied the system image to the new SSD. Afterwards I just used the windows disk management tool to assign the unallocated disk space to a new hard drive unit and format it.
    As other people have said, it’s a pity that the RAM capacity of the UX31a cannot be upgraded. But I am hoping that the new SSD will buy me more time with this light and beautiful laptop (the only problem it currently has is that the keys for numbers 5 and 6 don’t work very well, they need extra pressure; it’s annoying but acceptable).
    Thanks again to Jure and everybody who contributed to this site!!

    1. Hey, thanks for the comment. Just this week I had to change my keyboard on UX31A, I ordered new German keyboard from amazon and changed mine, because letter “S” did not work anymore. It is not hard to change it, just a lot of screws and taking off the glued parts. 🙂

      1. Hey Jure,

        can you provide me the link for the german keyboard on Amazon? and maybe you can provide me some info about your keyboard, if it is working fine?
        One key on my keyboard didn’t work, after I spill coffee on it… LOL And it is annoying… because i need this key very much “> Ende”.

        Well, is any user here installed
        I just purchased it today. I have read your blog multiple times, just don’t get the chance and money to update it yet.

        I used lubuntu as my system, after windows 8 crash. The only problem with lubuntu is, the battery and wifi. and my displaylink usb not working on ubuntu 14.04. I just tried ubuntu 16 and the driver work fine. So I decided to upgrade my ssd. I hope it work fine.

        Thank you for this great post!

        1. Hey,

          this is the keyboard I bought and it works great: http://www.ebay.de/itm/301425229557?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT (not a sponsor or anything).

          I have only some problems because I decided to tear key-caps from my slovenian (non-working) keyboard and transfer them to new german keyboard. (That is because we have some different letters in alphabet than german). Well problem is because I wasn’t careful when tearing keys from my slovenian keyboard and I broke some of the plastic hooks that keep it in-place. It is not a big problem as There are 4 hooks per key-cap and At most I have broke one. Most problematic key is key “7” which gets a bit loose if I press it at bottom-right. When I press it then in the middle it snaps back into place. But as I said that is my problem and not the keyboard.

          One minor thing is that new (german) keyboard did not have place for one of the screws for the battery, but others are enough to keep it in place.

          Tell me if you will need help in changing. Short instructions (as much as I remember it):
          -remove the lid,
          -remove battery (unscrew and unplug the connector)
          – disconnenct keyboard and touchpad
          – remove MB-IO flat cable and screws fixing fan to IO board (I manage to get the motherboard out without removing the fan and heat pipe – there is like 10 screws fixing it)
          – Disconnect the speakers and remove them (they are glued, some force required)
          – move the keyboard out of way (I did not even disconnect wifi and display)
          – You are presented with black keyboard backligt, it is glued to the back of keyboard, you carefully peal it (it is not glued so heavily as speakers)
          – Than you just have to undo like 40+ screws holding keyboard in.
          – swap the keyboard and do everything in reverse 🙂

          1. Thank you for the reply, Jure!

            I did ever open it up after the coffee incident, so it should be fine. The backlight on my keyboard also dead. Not entirely Because I still got light for the capslock and power button. As I understand, this keyboard doesn’t come with the backlight? right?
            Well it might be fine, I don’t mind about it. I already get used to id, I can use it without backlight.

            Btw, what are you doing with your old ssd? I think about this case
            So I can still use it as external drive.
            It is pricey…

            I will wait first for my drive, the keyboard can wait. I already used to it. LOL

        2. Hey, for some reason I cannot reply to your last comment, therefore I am replying to this one.
          Back-light is separate and is not included with keyboard. I think that you probably “fried” backlight, because it probably doesn’t work. The lights for CapsLock and power are (I think) integrated into keyboard.

          For me it was letter “S” that didn’t work, and well it is hard to write code (programs) if you don’t have one letter. Also I am used to Ctrl+S shortcut and I had quite a few incidences when I closed not-saved file.

          For the old drive – I bought adapter like this : http://goo.gl/QQWcdo and I have it connected into my stationary PC.

  115. Just ordered a Crucial MX300 275GB SSD + adapter from amazon, will update with my results when the parts come in next Tuesday! Thanks Jure for your in-depth information regarding the upgrade! :>

    1. Got my parts and did the swap.

      If you order the Crucial MX300 it comes with the activation code for Acronis True Image HD 2015 so that’ll let you clone your existing SSD to your new one easily !

      I ordered both my adapter and SSD from amazon:
      Crucial MX300: https://www.amazon.ca/gp/product/B01IAGSDJ0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
      M.2 NGFF Adapter: https://www.amazon.ca/gp/product/B014GVUH92/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

      Hope this helps anyone who’s looking into this SSD !

      1. What are the odds, I literally just ordered the same parts, because they both ship by Prime in Canada. Got the MX300 525GB SSD and the same adapter. Will be installing over the weekend.

        Did you end up insulating the parts in any way like this article shows? Or just simple plug and play with the adapter.

  116. Hi, I have the same Asus model and I would like to know what is the price for this type of compatible SSD? I asked in the official Asus tech support and the aswer was 500 eur (new disc, adapter and clone of the current disk) for 256 GB – isn’t that too much? Thx, Sabina

    1. Hi, you have number of links and disks different users tested. Just find it at your preferred dealer. For the adapter check amazon and ebay.

      Asus tech support offered you adapter? I am confused.

    2. I guess Asus offered you the XM11 SSD, which only 2 model produced! No wonder if the price so high. Like Jure stated, if they offer you an XM11, you don’t need adapter for it. 500Euro for 256GB, isn’t it a little bit pricey?

      I got Samsung 1TB for 300 something Euro. I don’t know how good you are in this, I just clone my disk to new ssd, It is working fine. I am on Ubuntu and Windows. If you have no idea how to do it, ask someone who has more experience, I am not responsible, if it is not working.

  117. I have a ASUS UX31LA. It is special because of two 128 GB disks set up as a 256 GB Raid 0 disk. So far I have not looked inside the machine to check what kind of disks they are. Do you know if there is an adapter which can be used to swap the original disks with M.2 disks?
    Thank you in advance.

    1. Looking at this photo ( http://i.imgur.com/VskJ2Hv.jpg – it came up when I googled ASUS UX31LA, I dont know if it is really UX31LA ) it seems disks are M.2 and you do not need any adapter. If this is true, you must be only careful about the length of the disks – M.2 disks come in different lengths.

  118. Hey Jure,

    I got my ssd already and installed! Now I got 1tb space with 2 Ubuntu and Windows! That’s great!

    For info,
    this model also works,
    Samsung Solid State Drive »MZ-N5E1T0BW 1 TB«
    More detail on here.

    Did someone purchased this?
    or this one

    I would like to hear about it before I purchased it.

    The adapter, that you suggested were good if I can use it for tower, sadly I don’t have one. I do have Gigabyte Brix pro, But I installed mSata on it, so I want to save the sata for normal hdd for more space.

    The keyboard has to wait. I don’t have time to change it yet, But your website were bookmarked!
    Thank you for writing such great article!

    Best regard

  119. Hi!
    I want to install a 256 or 512 SSD in my UX31E, I am clear that I have to buy an adapter to M2, but I’ve seen on the picture than the 512 Mb is 3.3 v and 1.7 Amps and the SSD that I find in Amazon are more voltaje (Crucial MX300: 5V, 1,7A)… is this a problem?.

    1. I don understan you 100%, but I would guess that voltages are a part of a specification of interface. On which picture did you see 5v?

    1. I dont know about MX300,

      but Crucial MX200 500GB CT500MX200SSD4
      is working. I used it before upgrading to my WD 1 tb

      1. Hello,

        just to make sure I understand, you installed a 1TB SSD on your UX21 (or UX31)?

        I want to do the same but I am not sure it works …


  120. Hi,

    Thanks for this great post, we have been struggling with this problem several days, because we cannot find Adata XM11 in Turkey. But with your precisious post, we found an alternative solution for our problem.

  121. I have a UX31L and didn’t pay attention to the fine details. Im now stuck with the adapter needed for the UX31A and a Samsung 250gb 850 Evo M.2 that wont fit in my laptop *sigh*. My laptop comes with a Sandisk ssd x110 sd6sp1m-128g-1002 stock (which is on the fritz – undiscoverable in bios, wont scandisk fully, etc). It seems as though my laptop has another slot for an SSD and by the looks of it, it fits a 2260 M.2 (i believe). Before i go ordering anything else, can anyone help confirm that for me?
    That’s a pic of my motherboard (Asus UX31L)

    Also, if there’s no way i can utilize the adapter + ssd, is there anyone on here that’d like to purchase it from me? I living Toronto. Willing to ship it.

  122. Hi,

    Crucial MX200 250GB, M.2 (CT250MX200SSD4) works on my Asus UX31A. Does anybody now if Crucial MX300 525GB, M.2 (CT500MX300SSD4) also fits?

  123. Herkese merhaba ,
    All As-salamu alaykum

    aynı problem bende de mevcuttu bu arkadaşın belirttiği yolu izledim ali expresten 5 dolara bi dönüştürücü aldım .
    Sonra bide dönüştürücünün de üzerinde yazdığı gibi 22:80 22:60 boyutlarına istinaden 20:80 (en boy) Kingston SSDNOW 120 GB SM2280S3G2 (http://www.hepsiburada.com/kingston-ssdnow-120gb-550mb-200mb-s-m-2-sata3-ssd-sm2280s3g2-120-p-BD805088)
    temin ettim . 270 TL de ona verdim ve şuan cihazı çalıştırdım diski anakarta takmam ve test sonuçları aşağıdaki gibi .

    Not : diskte hıza ve alan ihtiyacı değil bütçe göz önünde bulunduruldu.


    D:\IDM\chrome\WhatsApp Image 2017-01-31 at 14.00.22.jpg

  124. I had bought

    +mini adapter N-UX21

    used with
    +Samsung SSD 850 EVO SATA M.2 250GB

    fits the length perfect
    no tight problem issues for the back cover

    and with samsung magician program,
    it amazingly boost the sped of the ssd

    Dear Jure, thank you for this blog, that i did my investigation and choose the best ones.

    as the service repair was
    giving 6 months for a ssd (which was 2 times changed)
    which dies in 2 plus 1-2 months exactly.
    with the price 300$

    I had done the update, with exactly %60 price for this.
    (as i had also bought the long adapter for further use + a wrist antistatic band)

    +Rosewill ESD Anti-Static Wrist Strap Components RTK-002, Black/Yellow

    +this adaptor for spare/additionally needs
    Adapter NGFF M.2 SSD zu XM11 Zenbook UX21 UX31 UX51 M-ware® ID14822

    Best wishes,

  125. I had bought

    +mini adapter N-UX21

    used with
    +Samsung SSD 850 EVO SATA M.2 250GB

    fits the length perfect
    no tight problem issues for the back cover

    and with samsung magician program,
    it amazingly boost the sped of the ssd

    Dear Jure, thank you for this blog, that i did my investigation and choose the best ones.

    as the service repair was
    giving 6 months for a ssd (which was 2 times changed)
    which dies in 2years + 1-2 months exactly.
    with the price more than 300$

    I had done the update,
    with exactly %60 price for this.
    (eventough i had also bought an additional “the long adapter for further use + a wrist antistatic band)

    +Rosewill ESD Anti-Static Wrist Strap Components RTK-002, Black/Yellow

    +this adaptor for spare/additionally needs
    Adapter NGFF M.2 SSD zu XM11 Zenbook UX21 UX31 UX51 M-ware® ID14822

    Best wishes,

  126. Just did the swap of two 256GB ADATA XM11 on a UX51Vz.
    I used “M.2 NGFF SSD to ASUS UX31 UX21” adapters and replaced the old SSDs wich started to behave badly: corrupted files, inconsistent read/write speeds.
    I replaced them with two Samsung 250GB 850 Evo M.2.

    The adapter+ssd seems a bit larger than the original ssd+heat cover, but not too big, and I think it works for the better since now it has a better contact with the back cover and can dissipate heat easier. I also had to isolate the cover with parts of the antistatic package.

    Here are the CrystalDiskMark speeds:
    Original ADATA XM11 256 GB RAID0:
    Seq Q32T1: 1003 MB/s (read) 491.8 MB/s (write)
    4K Q32T1: 385.7 MB/s (read) 222.6 MB/s (write)
    Seq: 929.6 MB/s (read) 497.6 MB/s (write)
    4K: 23.52 MB/s (read) 44.99 MB/s (write)

    Samsung 850 Evo 250 GB RAID0:
    Seq Q32T1: 970.0 MB/s (read) 958.5 MB/s (write)
    4K Q32T1: 239.9 MB/s (read) 205.1 MB/s (write)
    Seq: 958.3 MB/s (read) 895.5 MB/s (write)
    4K: 25.09 MB/s (read) 42.68 MB/s (write)

    After 3 days, the system seems stable (might also be from the new windows installation). Speed is not noticeable. The original was already pretty fast since it came in RAID0. I had some issues with configuring RAID0 since the boot menu didn’t show up. So I had to boot with one new and one old, get a RAID error and enter the RAID menu, reconfigure RAID0, bring the second new SSD, and repeat.

  127. Huge thanks, Jure and all contributors, for this excellent post. It was a lifesaver for me. I am reporting here a new success case with a different model of SSD.

    The SSD in my UX31E crashed (unable to start or to recover from the recovery partition). It was a 128 MB SanDisk. 4 years & 9 months since I bought it.
    Thanks to your instructions and feedback I got this SSD and adapter, and it is working:

    – “QUMOX M.2 NGFF 240GB SSD Type 2280-S3-B-M SATA SSD PCIe” from https://www.amazon.es/gp/product/B01M0O19SP/
    There is barely any detailed information about this brand and model, but all reports from people who have bought it were good. The price is unbeatable (71€).

    – “ZTC Thunder Board NGFF M.2 M or B Key SSD to 18Pin. Model ZTC-AD003” from https://www.amazon.es/gp/product/B00WH7U0TA/ at 14€ (I got a refurbished one for 5€)
    That’s the large adapter –I was in a rush and could not wait for a small one from China-

    – comparison of adapter, old & new SSD: https://drive.google.com/open?id=0B-Kpcv-31q6gU25lSUFGTHlkakk
    – comparison of old SSD and new SSD mounted on the adapter: https://drive.google.com/open?id=0B-Kpcv-31q6gaG9ZU0ZnQnUxNHM
    – side view of new SSD on the adapter (thickness problem): https://drive.google.com/open?id=0B-Kpcv-31q6gSnVZamxobVViRWc
    – new SSD, installed in the computer: https://drive.google.com/open?id=0B-Kpcv-31q6gSThkcG5zNVY2Vkk

    I could fit them without effort despite a little pressure on the back cover — I did not put any insulation.

    The computer recognised the new disk, but I have not been able to restore the system using my Recovery DVDs –it says it has reinstalled the recovery partition (yes, it is there) but the computer will not load recovery utility using F9.
    So finally I prepared a bootable USB with Win7, and Windows installed successfully only after I removed all existent partitions.
    I am now manually installing drivers from Asus website and configuring the system.

  128. Hi everybody and thanks for the useful post! I wrote this in the temperatures problem’s post, but nobody replied, 🙁
    I need some help with the temperature of my Asus UX31 after changing the SSD:

    I’ve changed my old crash A-DATA in my UX31 and I installed a Samsung EVO 850 M.2 with the M.2 adapter and I installed Windows 10 from scratch. I cleaned the fan.
    Before my SSD crashed, I installed the W10 update over W7 original. Now I have the problem that my machine heats up (the fan starts to work too soon comparing to my previous installation before the ssd crash), and the OS crashes too and reboots. I updated completely the OS. What I’m doing badly? Do I have to use some special tape between the new SSD and the asus cover?

  129. Hi guys,

    Thanks4allyourposts! Helped a lot.

    Yesterday I succesfully replaced the SSD of UX31e with WD Blue 256Gb m2 using this adapter https://www.banggood.com/New-M_2-NGFF-SSD-to-18-Pin-Blade-Adapter-Card-for-Asus-UX31-UX21-Zenbook-p-1018653.html. Only $6. Got it within one week after order.

    Easy job with the right screwdrivers. System is faster then before.
    This guy made an instruction video with adapter: https://www.youtube.com/watch?v=ev7DY4rb8Ro

    So for about $100 I got a fix and speedupgrade for my laptop!

    Great! Regards from Amsterdam

  130. FYI to ALL!

    This should solve and answer most questions……

    ANY m.2 SATA SSD will work 100%. Take note those… “m.2 SATA”

    The reason why i say this is because there are m.2 PCIE variants, which are newer and much MUCH faster than the older m.2 SATA SSDs available, however those don’t work! …i know i tried with a samsung evo 960 m.2 pcie

    So look for/purchase m.2 SATA SSDs ONLY and install it with the aforementioned adapter and you’re good to go! 🙂


    1. Also note:

      m.2 PCIE variants have ONE notch
      m.2 SATA variants have TWO notches

      Enjoy the upgrade! 🙂

  131. My Zenbook UX31A wouldn’t boot anymore, and the ADATA XM11 128GB was indeed dead.

    I replaced it with the SSD Samsung Serie 850 EVO M.2 – 250 GB and the adapter “128G 256G 512G M.2 NGFF SSD Adapter card for Asus UX31 UX21 TAICHI 21 TAICHI 31” bought from ebay which I received in 15 days.

    It works very well and I also used the anti-static material stuck to the old SSD to cover the new one.

  132. Thanks for a great article! It made the upgrade easy.

    I used an MX300 525 GB (CT525MX300SSD4) with an adapter which fits perfectly, runs quick and no problems with temperature (CPU: 50-55C idle 60-65C during load | ssd: 50C under Windows 10). When I tried linux, I was getting overheating issues (70C idle to 90C under load). I tried everything from kernels to drivers to power management etc. So for now I’m sticking with Windows 10. Disk speeds using the same settings as in your article (3 – 1GiB): Read [MB/s] Write[MB/s]
    Seq Q32T1 517.8 503.1
    4K Q32T1 110.2 90.16
    Seq 446.4 461.4
    4K 20.99 46.94

    I overpaid a bit for the adapter but I didn’t want to wait a month to a month and a half until it got to me from China (my original disk failed after 3.5 years).

    13.70 Euro for adapter

    154.18 Euro for the SSD

  133. Thank God that I find this site!!!!
    I need the help so that I would not buy something that will not work.
    My ADATA XM11 256GB is dead can I Upgrading to 512GB SSD if yes how? Just buy it as it is or buy first the XM11 256GB and then buy the 512GB SSD? Thanks in advance!

  134. Anyone try WD BLUE PC SSD M.2 1TB with Asus Taichi 21 ? Work?
    Please advise.
    Thank You.

  135. Hy i just tried this solution but my ux31a doesn’t open at all now its like it has no power, but if i take out the adapter / the new SSD it starts normal to bios as it has no SSD but still , does anyone have any ideas how to fix this ?

  136. My SanDisk U100 XM11 from my UX31E startet dying (1mb/s random read and write speed). So I replaced it with:
    that adapter:

    and that SSD:

    I applied thermal paste on the SSD-dies, then put the anti-static foil on top and then again thermal paste. It just touches the lid, so the adapter is perfect imho.

    However, i want to recommend to test your anti-static-foil with a multimeter, since not every anti-static-foil (especially the bags) are insulated on both sides (outer-surface IS sometimes conducting), it shouldn’t be a problem since the resistance is very high but if you run into instabilities, that could be the problem (it won’t damage anything permanently though).

    The original SSD had no casing what-so-ever and certainly did not touch the ultrabook-lid, so i dont think (on the UX31E) there will be any heat-problems. In case of the Intel 540 SSD i bought there isn’t even a temperature sensor integrated (and after 1 hour data-transfer the lid was barely warm).

    Regarding the OS, I was not able to boot with the backup-files i created via asus, probably because this SSD has more storage. A clean-install however worked just fine and the Windows-Key is automatically pasted via the bios, I only had to install the drivers (naturally).

    Thanks to everyone who commented and of course the initial creator of the topic.

  137. Thank you for this article! We have at home UX31A and SSD died this morning, notebook boots only into BIOS not seeing any drive. I have already ordered adapter and now also choosing the right SSD 🙂 cheers!

    1. Saying that and I`m not able to edit my 1st post: Since old Adata SSD is dead, I have no access to the data and windows anymore. How can I find and know product key code for my Windows what was installed along with the notebook? Please help

        1. Let me reply once again and summarize my experience. I have bought at first this adapter https://www.amazon.de/dp/B00XJRQPV4 (because of urgency to have working PC). It worked, but for sure there is thight fit and when I have made small pressure on the notebook on the “wrong place” PC froze and have to restart from time to time.
          For all the people in future, buy this adapter instead https://www.ebay.com/itm/321843326589 it is much better and cleaner solution with no “tight fit” issues. It arrived few days ago and notebook is perfect now.
          Regarding issue with windows. I have asked ASUS for windows key, they did not provide me that and asked me to send them the device and pay 50e for windows 8 installation. I have decided to go other way. Directly from Microsoft page https://go.microsoft.com/fwlink/?LinkId=691209 (link might change in future) I have downloaded MediaCreationTool.exe which creates bootable USB for you. And guess what, Windows automatically took windows serial key from the BIOS (or where it is stored) and Windows is activated right away after the installation !!!

          1. Hi, yes if you have UEFI bios, serials are usually stored in the bios. I thought UX31A is still on the old BIOS (I have changed the laptops and I don’t use anymore my UX31A).

  138. Hi everyone
    I bought SAMSUNG 850 EVO 500GB (MZ-N5E500) to install on my Asus Taichi 21, I used the Adapter.
    The disk is detected by the pc, but when installing Windows 10, it blocks in the part of creating the partitions. What can it be ?
    thank you for your help

  139. UX31E with original SanDisk upgraded to 525 GB yesterday.

    I found this post about two years ago but just recently decided to order all the parts listed and upgrade my tired, old SSD with only 3.5 GB free left. You can guess it was a pain to use it but not anymore. Here is my shopping list:

    1.Crucial MX300 525GB M.2 (2280) Internal Solid State Drive – CT525MX300SSD4

    I got mine for £136.30 but at the moment it’s even cheaper at £125.99 and free delivery.
    Big – Thank you to Crucial for adding a free download version of Acronis with the SSD.

    www,crucial.com/acronis – you need a Crucial drive connected to computer to use it. It does not work without it.

    Check at amazon.co.uk for the SSD. The next two items I got from ebay.

    2. 128G 256G 512G M.2 NGFF SSD Adapter card for Asus UX31 UX21 TAICHI 21 TAICHI 31

    The adaptor cost me £7.65 and took about 20 days to arrive but I can recommend it. It works absolutely fine and is slim enough to make no difference in thickness when installed.

    3. Asus UX31 UX21 ADATA XM11 USB 2.0 Cable xm11zzb5 SSD To 2.5″3.5″SATA Adapter new

    Cost me £14.97 but if you shop you may find it cheaper. I am happy with the purchase as it did the job perfectly.

    In total less than £160 for parts excluding the tools which I already have. The whole process took about an hour. Acronis was showing 25 minutes but it took about 40 min in real time to clone the drive. I decided to do it the simplest way possible. New Crucial SSD connected with both adaptors to USB port as external drive. I cloned the disk using automatic settings with Acronis. The original drive was left inside laptop and my new connected as external drive. My Windows is activated and apart from one report that tablet driver was not working it is all looking good. Tablet driver sorted by restarting the service. I have 348 GB free now and laptop is much more responsive. I still got the original drive as an external drive, which is a great bonus. Thank you for the great article, advice and help.

  140. My Asus Zenbook Prime UX31A-R4003V became so slow, but it is not utilized at all. The disk has around 40% free space. I was wondering if the problem is the SSD. Is it too slow?

    I did a benchmark and this are the results:

    AS SSD Benchmark 2.0.6485.19676
    Name: SanDisk SSD U100 252GB
    Firmware: 10.5
    Controller: iaStor
    Offset: 336896 K – OK
    Size: 234,69 GB
    Datum: 30.01.2018 20:07:58
    Read: 440,63 MB/s
    Write: 55,88 MB/s
    Read: 9,35 MB/s
    Write: 6,60 MB/s
    Read: 25,52 MB/s
    Write: 6,45 MB/s
    Read: 0,542 ms
    Write: 0,530 ms
    Read: 79
    Write: 19
    Total: 122

  141. I’m the owner of 2 Asus UX31A laptops. One with W7 and one with W8.

    For some time I had the intension to update both M2 drives to larger drives. I had already bought the prints. Since I build my first computer in 1980 and had since then a lot of practice, even with tabs, it was only my doubt about fitting that kept me waiting. Since the laptops worked fine without any problems and I had plugged in both a small 128Gb usb drive, there was no urgency.

    After rereading the experiences of the users in this article, and considering the fact that it was possible to bring the first laptop (W7) on W8.1, I thought to give it a try.

    Since Acronis Easy Migrate and Aomei both failed due to the GPT disk to clone the disk and I normally clone with a hardware box (which was not possible since the Adata disk seams to have a mini-pcie interface) I also used Gparted and DD both did neither work. Macrium did the trick without any problem. Since I had to install a new OS (W8.1) on the older machine (W7), I installed that one without any trouble. The newer one (W8.1) was cloned with Macrium. I taped off the bottom of both laptops as I read from the article and comments.

    The Adata’s that where in my laptops had a kind of hard cover (a kind of plastic) during the cloning the Adata got really hot.

    This operation gives me the possibility to put a 1 TB in it, because cloning can be done now very easy and it gives the opportunity to put a clean drive in it and give it a try to install W10 or Linux.

    I want to thank all of you for your good ideas and information.

  142. Successfully installed Samsung 860 EVO 500GB M.2 SATA Internal SSD (MZ-N6E500BW) into:



    Bought this to mount new ssd into in order to clone old drive to new drive (will not use after cloning complete, also my product became REALLY hot):

    Bought the following from the recommendation of users on this site to mount new ssd to Zenbook:

    Used EaseUS Todo Backup Free 10.6 to perform a System Clone after initializing new drive through usb adapter. *****Do not format new drive (fat 32, ntsf etc) but leave the space as unallocated.

    Installed new drive and

  143. Hi, thank you all for your brillaint posts!

    My case: UX31A with failed ADATA XM11. By this blog’s recommendations I’ve got:

    1) Adapter https://www.ebay.com/itm/321843326589 (3 weeks delivery from China)
    2) Samsung 860 EVO 250GB M.2 SATA Internal SSD (MZ-N6E250BW) from https://amazon.com/gp/product/B07864V6CK
    3) XM11 -> USB adapter https://amazon.com/gp/product/B00KZI9JYK

    Fortunately I was able to dump almost all data from old SSD with ddrescue utility and clone it to the new disk.

  144. I’ve just successfully upgraded my Asus UX31A with a Samsung 860 EVO, 1000GB, M.2 2280 https://www.samsung.com/us/computing/memory-storage/solid-state-drives/ssd-860-evo-m-2-sata-1tb-mz-n6e1t0bw/ together with the above mentioned adapter https://www.ebay.com/itm/321843326589. I needed to do a clean install of Windows 10 with a USB stick, because the disk needed to be setup with GPT. Systems now runs without any problems.
    Thanks to everybody providing valuable information for the upgrade.

    1. I did the exact upgrade as Stefan, but used Samsung 860 EVO, 500GB, M.2 2280 instead. I used the same adapter and fresh installation of Win 10 with USB Stick like him. It is working like a charm.
      Thanks jure and the community for the help.

  145. I just successfully upgraded my wife’s Asus Zenbook UX31E with a Samsung 860 EVO 500 GB M.2 SATA drive using the short M.2 adapter. I used a jump drive with clonezilla to clone the existing drive with Windows 10 to an image file on an external drive. Before cloning, I removed the original and unneeded Asus Windows 7 recovery partition. After installing the new Samsung 860 EVO drive, I used clonezilla again to clone back the image file to the new drive. Everything worked perfectly. Thanks to all for your help especially with the tip on the shorter M.2 adapter. It fits and works perfectly.

  146. I just successfully upgraded my wife’s Asus Zenbook UX31E with a Samsung 860 EVO 500 GB M.2 SATA drive using the short M.2 adapter. I used a jump drive with clonezilla to clone the existing drive with Windows 10 to an image file on an external drive. Before cloning, I removed the original and unneeded Asus Windows 7 recovery partition. After installing the new Samsung 860 EVO drive, I used clonezilla again to clone back the image file to the new drive. Everything worked perfectly. Thanks to all for help on everything especially on the tip to use the shorter M.2 adapter. It fits and works perfectly.

  147. Dear Jure and other blog contributors

    Thanks so much for all of your helpful comments. I have a Zenbook UX31A Windows 7 laptop which has an ASUS 256GB SSD. I wanted to upgrade the SSD to 1 TB and copy over all of the OS, data and original ASUS recovery partition.
    I am not an expert in upgrading systems so please take my comments with caution. Following the advice provided on Jure’s site:
    1) I purchased a 1TB Samsung 860 EVO 1TB M.2 SATA Internal SSD from Ebay for $145. Samsung lists them here:
    2) I purchased a “Useful USB3.0 TO M.2 NGFF SSD External Enclosure Storage Case Adapter ba#cd KZ” for $13 to allow me to insert the new SSD into an USB adapter and thus copy the OS and data and partitions from the 256GB internal SSD to the new 1TB SSD via the USB port (see later). The SSD slid into the USB adapter without problems, but it is advisable to replace the front and back plate and rescrew to allow easy insertion and removal from the USB port.
    Source was: https://www.ebay.com.au/itm/132576488224
    3) I purchased a “128G 256G 512G M.2 NGFF SSD Adapter card for Asus UX31 UX21 TAICHI 21 TAICHI 31” for $10.88 to connect the new SSD to the slot in the laptop (I also bought a “M.2 NGFF SSD To 18 16+2 Pin Adapter Card for Zenbook SSD Applied Asus UX31 UX21” from Ebay but decided to not use it due to its greater thickness which might cause problems with closing the back of the laptop).
    Source was: https://www.ebay.com/itm/321843326589
    4) After downloading the free AOMEI Partition Assistant Standard Edition 7.5.1 from:
    I connected the new SSD via the USB port and after seeing that it was detected (but of course not showing up as a drive), I ran AOMEI and selected Migrate to SSD. This showed my 256GB SSD which consisted of a C: drive and a recovery partition and the new SSD. I clicked on my old SSD as the source and selected the 1TB SSD as the target. After clicking that it should proceed, AOMEI loaded a pre-OS mode (a type of virtual OS) and after a couple of reboots, it appears that I had a clone of the 256GB SSD including the recovery partition.
    5) Although I changed the BIOS order of booting, I could not get the new SSD to boot, but I could see it in Explorer and could access the files. However the guide for using AOMEI:
    says that if the new drive does not boot then exchange the source disk with the new one and try booting again (this worked as discussed below)
    6) After ensuring that the laptop was totally turned off, I opened the back of the laptop as discussed in the early pages of this blog (as it happens, simply by removal of 10 shot and 2 long screws) and removed the existing SSD by unscrewing its retaining screw allowing it to pop up and be removed. A useful view of this is at:
    but I did not remove the stickers on the components in the video prior to doing this (I am not sure what the purpose of it was as I do not read Russian). Having inserted the new SSD into the M.2 NGFF SSD Adapter card I then tried to fit the adapter into the laptop’s connector at a 45 angle. Initially it seemed that the adapter would not fit the laptops slot but after several gentle attempts it slid into place. After screwing the adapter and SSD to the laptop with the adapter screws supplied, I closed the case and screwed it up. I did not use any insulation between the new SSD and the case as the case lid already had some type of insulation/heat transfer attached to it.
    7) Booting up worked fine and the Crystaldiskmark test scores were:
    CrystalDiskMark 6.0.2 x64 (C) 2007-2018 hiyohiyo
    Crystal Dew World : https://crystalmark.info/
    * MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
    * KB = 1000 bytes, KiB = 1024 bytes
    Sequential Read (Q= 32,T= 1) : 562.658 MB/s
    Sequential Write (Q= 32,T= 1) : 530.424 MB/s
    Random Read 4KiB (Q= 8,T= 8) : 112.830 MB/s [ 27546.4 IOPS]
    Random Write 4KiB (Q= 8,T= 8) : 308.334 MB/s [ 75276.9 IOPS]
    Random Read 4KiB (Q= 32,T= 1) : 190.664 MB/s [ 46548.8 IOPS]
    Random Write 4KiB (Q= 32,T= 1) : 198.346 MB/s [ 48424.3 IOPS]
    Random Read 4KiB (Q= 1,T= 1) : 21.637 MB/s [ 5282.5 IOPS]
    Random Write 4KiB (Q= 1,T= 1) : 75.375 MB/s [ 18402.1 IOPS]
    Test : 1024 MiB [C: 20.0% (186.2/930.9 GiB)] (x5) [Interval=5 sec]
    Date : 2019/01/20 13:42:12
    OS : Windows 7 Professional SP1 [6.1 Build 7601] (x64)
    Which are much better compared with the original values:
    CrystalDiskMark 6.0.2 x64 (C) 2007-2018 hiyohiyo
    Crystal Dew World : https://crystalmark.info/
    * MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
    * KB = 1000 bytes, KiB = 1024 bytes
    Sequential Read (Q= 32,T= 1) : 453.961 MB/s
    Sequential Write (Q= 32,T= 1) : 51.781 MB/s
    Random Read 4KiB (Q= 8,T= 8) : 28.073 MB/s [ 6853.8 IOPS]
    Random Write 4KiB (Q= 8,T= 8) : 9.413 MB/s [ 2298.1 IOPS]
    Random Read 4KiB (Q= 32,T= 1) : 28.181 MB/s [ 6880.1 IOPS]
    Random Write 4KiB (Q= 32,T= 1) : 8.709 MB/s [ 2126.2 IOPS]
    Random Read 4KiB (Q= 1,T= 1) : 8.279 MB/s [ 2021.2 IOPS]
    Random Write 4KiB (Q= 1,T= 1) : 9.783 MB/s [ 2388.4 IOPS]
    Test : 1024 MiB [C: 90.2% (211.6/234.6 GiB)] (x5) [Interval=5 sec]
    Date : 2018/12/15 13:16:14
    OS : Windows 7 Professional SP1 [6.1 Build 7601] (x64)

    Also tests with HWINFO 64 LAPTOP MONITOR indicate that the CPU temperatures in the low 50s to 60C and the SSD is in the low 50s
    In conclusion, a very useful upgrade thanks to Jure and all of the contributors.

    1) Does anyone know if it is possible to install a NVME SSD into an ASUS Zenbook UX31A instead of a SATA M.2 and what type of adapters are required? The reason for asking is that this type of SSD is about 7 times faster than the normal SATA M.2
    2) Is it worthwhile using the old ASUS 216 GB SSD in some way and is there a USB adapter that can allow it to be used as an external SSD? I note that someone in the blog commented on the high temperature of the SSD while in the USB connector and I noticed this while migrating the OS to the new SSD/USB and this may be a problem for such an application.

    Thanks to all from Australia

    1. Hi,

      glad to see this post is still useful. Regarding NVME, I do not konw, I have never tried. NVME must be supported by the motherboard and I don’t know if the one in UX31A does. One way to check would be to check in the BIOS changelog and see if, for example, there was a BIOS upgrade that changed/enabled this, as I don’t think that that in 2012 it was included into UX31A. Although according to wikipedia: https://en.wikipedia.org/wiki/NVM_Express , standard already existed since 2011. But my guess is that even if it was included, without firmware upgrades to the latest nvme specifications you wont see such performance increase.

      I dont exactly use the drive from UX31a as a external USB drive, but another 512GB I had laying around. I have put it in a msata portable case and it gets quite hot rather quickly. As it heats up the transfer speeds are throttled. In summary, it is great as a “big USB drive”, but when transferring huge amount of data not so much faster than some mid-range 3.0 USB thumb drives on the market.

      1. Jure, thanks for your fast reply and thanks for your blog which has been helpful for many years to ASUS Zenbook users

  148. Jure, you are a lifesaver. Also thank you to the other commenters who suggested SSD’s. I am going to upgrade my SSD this weekend. There is nothing wrong with the 128GB SSD already in my machine, but I feel like after years of putting up with storage limits it’s time. Also, I will be experimenting with page/swapping on a faster SSD since many UX31A owners know the RAM is not upgradeable on most makes. Hoping to report back here when I get results.

    FYI anyone in the United States / Canada, there is now a seller who is selling the M2 -> UX31A SSD adapter for only $7.90 shipped (prime eligible): https://www.amazon.com/KNACRO-SATA-NGFF-Adapter-Card/dp/B01MZ69UX0/ref=as_li_ss_tl?ie=UTF8&qid=1548280926&sr=8-3&keywords=ux31a+adapter+ssd&linkCode=ll1&tag=creativecode-20&linkId=11b386cfd866c976df0a1fd02f00967e&language=en_US

    Really beats having to wait 1-2 weeks ordering from eBay or even longer for Ali 🙂

  149. Hi,
    My 256 GB Sandisk SSD for ASUS UX31A died. Purchased the following WD Blue 250 GB SSD and Adapter Card from Amazon Canada. Worked like a charm! (just the back cover is little tight as the connector on the adapter card is slightly higher).

    Both the items are available on Amazon Prime and were delivered in 2 days.

    WD Blue 3D NAND 250GB PC SSD – SATA III 6 Gb/s M.2 2280 Solid State Drive – WDS250G2B0B
    Sold by: Amazon.com.ca, Inc.

    M.2 NGFF SSD to 18 Pin to Asus UX31 UX21 Adapter Card SATA Transfer
    Sold by: RDEXP (Canada UBI Express Line, 10-16 days to arrive)


  150. Have just fitted a Crucial CT1000MX500SSD4 2280 (1TB) £113
    Used a UX21 to M2 Adapter bought from Ebay for £8
    (M.2 NGFF SSD Adapter card for Asus UX31 UX21)

    New drive + adapter was exactly same length and depth as Adata.
    Laptop rear panel already had insulation covering drive area.
    So all fitted a dream. Rear panel as flat and snug as ever.

    Used Macrium Reflect (Free) to create Image File of old drive on external USB Drive
    Fitted new 1TB drive
    Booted from USB Pen Drive containing Hiren’s Boot CD
    Used Macrium Reflect to restore Image File from USB Drive
    Used Easus Partition Manager to resize parition(s)

    All working 100%

    This site/forum gave me the information and confidence to proceed with this upgrade, so huge thanks to all contributors xx

  151. Hello,

    The SSD on son’s UX31A finally gave up the ghost.
    What is the recommended adapter nowadays?

    Thank you!

  152. I have just upgrade my asus zenbook ux21e with 256gb ssd transcend m.2 830s sata 3 6gb/s with win 10 . Works perfectly fast.

  153. Upgrading SSD in Asus UX31E
    Can I use
    WD Blue 3D NAND SATA SSD WDS500G2B0B [WDS500G2B0B]
    Crucial MX500 [CT500MX500SSD4]

    Which one is best?

    And what about adapter – is this the right one?
    (Ebay: 128G 256G 512G M.2 NGFF SSD Adapter card for Asus UX31 UX21 TAICHI 21 TAICHI 31)

  154. I installed samsung evo 850 250gb 1 year ago. and still couldn’t fix the issue with the touchpad. it feels not right. let me put it this way, if there is any gamer here, it used to feel like 60fps when moving the cursor now it feels like 50fps. mouse works fine though.

  155. Anyone know if there is an alternate way to power up the UX31A? My keyboard connector is finally shot after fixing it a hundred times over the last 7 years. New keyboard won’t work either, it’s the connector. Wondering if anyone has experimented and found pins somewhere on the board to replicate the power button?

    1. Have you tried with external device (mouse or keyboard) plugged into the usb. This should probably work if device is sleeping and usb-wakeup is enabled in the bios and/or windows.

      Regarding shorting the pins on the connector – you should try to find schematics and follow the traces. Second option is schematics of the keyboard.

      Third option would be (i dont know your electronics skills, but this is how i would go about it):
      1. Try to identify pins connected to the ground and pins that are high (e.g. 3.3v, 5v, etc.) on the motherboard connector. It is high probability that these pins are on either of the edges.
      2. When you have identified GND and high pins on the MB try to see if power button on the keyboard shorts any of these pins to another pin on the keyboard connector.

  156. I just purchased the following adapter: Micro SATA Cables M.2 NGFF SSD to 18 Pin Blade Adapter for Asus UX31 UX21 Zenbook from Amazon.
    I am debating on a 500G or 1 Terabyte. Anything smaller is simply inadequate. Some people have warned that Some newer specs may be too high for the older UX31. ARE THESE 1 Terabyte Options compatible with this Adapter using UX31A:

    Crucial MX500 1TB 3D NAND SATA M.2 Type 2280SS Internal SSD – CT1000MX500SSD4

    Samsung SSD 860 EVO 1TB M.2 SATA Internal SSD (MZ-N6E1T0BW)
    I edit a lot of Graphics and store lots of images for my business. Speed is not too important, but Capacity is a MUST. Any Thoughts and Suggestions would be appreciated.

    Herman Bongco
    Modelworks Direct

  157. Thanks so much Jure for this post. I upgraded my UX51 with the suggested adapter and a Samsung 860 EVO M.2SATA 1TB drive which has 2 notches–works flawlessly.

    Just a heads up to those looking for a drive, DO NOT USE NVMe drives since they do not fit. Ask me how I know.


  158. Thanks all for the information. I have an Asus Zenbook UX31A notebook with a 128G SSD and I wanted to upgrade the SSD to a larger one. With all these helpful replies, I was able to do a successful upgrade to a 1TB M.2 SSD with ease. I used the following items from Amazon:
    Thanks to all with your helpful suggestions. I am happy with my upgrade.

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