Partition disappears in Windows 10 Anniversary Update

Microsoft hoped the Windows 10 Anniversary Update would literally be a revelation for all users, but shortly after installing the update, users encountered various issues. Despite Microsoft’s efforts to anticipate all the possible bugs, the list of complaints is getting longer every day.

Many users are reporting that some of their partitions simply disappeared after installing the Anniversary Update. Usually it’s the smallest partition that disappears, although we couldn’t say for sure whether the partition is deleted or if Windows simply doesn’t detect it. Some users are informed that the partition is not allocated, while others can detect it once they install partition management apps.

Users complain their partition is gone after Anniversary Update

I  began installting the update yesterday evening before going to bed. Now I see that my D: partition is gone. In the disk manager it says “149,05GB Unallocated”. It is a 160GB Intel SSD. I had most applications installed and all my personal files on this partition.

Users report partition won’t mount after Windows 10 Anniversary Update

partition gone anniversary update

Since updating to the Anniversary update earlier one of my partitions won’t mount. It’s on a 3TB Seagate ST300DM001 HDD which I have split into 1 2TB partition and 1 1TB partition. The 1TB partition mounts fine however the 2TB doesn’t, this was working fine before the update in Windows 10 and the drive is using GPT.

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One program that helps in such situations is the MiniTool Partition Wizard. The program successfully detects the partition, allows users to assign a drive letter and access the partition in File Explorer.

Other users suggesting installing Acronis Virtual Disk Drive for 2 TB+ drives, and confirmed that in their case the partition magically re-appeared with all the files intact. You can try this workaround as well, download Acronis Virtual Disk Drive, and see if it works for you.

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  • r4in

    Lovely.

  • Hi, everyone thanks for the nice post by MADELEINE DEAN.
    By now, our tech team do not find what cause this issue, but, we find the solution, if you just reset the drive letter, it could not solve the problem after reboot your computer, the best way to solve this problem is using the feature “Partition Recovery” by MiniTool Partition Wizard

    • Hwoarang5

      i have the same issue on my Western digital blue hssd 4tb hardisk, i have to reinstall Acronis Virtual Disk Drive,and it magically reappear, but after update and reboot its gone again i have to reinstall the disk drive, will using Partition recovery by minitool partition wizard fix it permernantly and retain all my data?

    • Hwoarang5

      please help i using partition recovery and now to recovered an empty drive, it was a 2tb partiton it split 1 tb to nfts with nothing inside and another 1.6tb of unknown file format…. PLEASE help i have alot of date lost inside , PLEASE!!

  • Leighroy

    Didn’t work for me. Just roll back the update. Much simpler.