Updated to 1803 via Windows Update - now D: OEM partition is showing  

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  1. Posts : 297
    Windows 10 Pro x64

    Try to use the AOMEI Partition Assistant 7.0 by deleting the OEM partition, merged partition & then reboot.

    How to merge the Health (Recovery Partition) in Windows 10 Solved - Windows 10 Forums
      My Computer

  2. Posts : 29,056
    Windows 10 (Pro and Insider Pro)

    baryalex said:
    Hello all,

    Remove Drive Letter in Windows 10 Windows 10 Tutorials

    Open command prompt or windows powershell (Run as administrator)


    mountvol [your desired partition]: /d and press Enter. OEM partition will be removed after that :) in my case I had E letter, Threadstarter has D letter so do like I wrote

    My case - mountvol E: /d
    Alexncfc case - mountvol D: /d and hit Enter button

    This is it :)
    SDMF74 said:
    Same exact issue here and constant warning off low space but nothing to delete!
    Above procedure didn't work?
      My Computers

  3. Posts : 2,795
    Linux Mint 20.1 Win10Prox64

    This does not happen when performing fresh Windows Install. Only happens when you perform update.
    Even though the name was change from Recovery to OEM, the partition ID is still: DE94BBA4-06D1-4D40-A16A-BFD50179D6AC

    Removing the Drive Letter is not enough. You need to set the correct Attributes for this partition to prevent Drive Letter assignment.

    Open Admin Command and type:

    select disk # where # is the disk # of Windows
    select partition 1
    deltail par

    You should get the result as follows:
    Updated to 1803 via Windows Update - now D: OEM partition is showing-p1.jpg

    If not, from diskpart, set the partition ID and Attributes:

    set id=DE94BBA4-06D1-4D40-A16A-BFD50179D6AC override
    gpt attributes=0x8000000000000001

    NOTE: setting gpt attributes will prevent Drive Letter assignment on this partition.
      My Computer

  4. Posts : 1
    Win 10

    Here's how you remove it from OEM partition. Let's assume in this scenario that the OEM partition has letter F and it's listed as Volume 4. Here are the steps:

    1. Do a search for cmd and right click it and run As Administrator.
    2. Type the following commands one by one (hit Enter after each one of them):

    > diskpart
    > list volume
    > select volume 4
    > remove letter=F

      My Computer

  5. Posts : 1
    Windows 10

    I'm a new member, just joined to comment on this post.

    I also just updated to Windows 10 build 1803 and was presented with a new drive D.

    I do not see this as a minor issue. When I insert an SD card into my laptop, it is assigned the drive letter D, and I have procedures setup to recognize drive D. Microsoft displaying a hidden partition and assigning it a drive letter, in my opinion, is not a minor issue. I hope Microsoft fixes this problem promptly
      My Computer

  6. Posts : 67
    Windows 10

    Agreed that this is an annoyance but the diskpart commands mentioned above worked for me. Surprisingly, I tried to fix it first using mini-tool and it wouldn't work. On a positive note, it is nice that Microsoft finally hides Recovery and other non-optimizable partitions/volumes under "Optimize."
      My Computer

  7. Posts : 4
    windows 10

    AndreTen said:
    This could be the quickest solution. Thanks @baryalex. isn't mountvol part of Windows server ...
    What I get is "the directory is not empty"
      My Computer


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