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

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  1.    09 May 2018 #21

    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 ComputerSystem Spec

  2. AndreTen's Avatar
    Posts : 15,258
    Windows 10 (Pro and Insider Pro)
       09 May 2018 #22

    baryalex said: View Post
    Hello all,

    Remove Drive Letter in Windows 10 Windows 10 Tutorials

    Open command prompt or windows powershell (Run as administrator)

    Type:

    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: View Post
    Same exact issue here and constant warning off low space but nothing to delete!
    Above procedure didn't work?
      My ComputersSystem Spec

  3. topgundcp's Avatar
    Posts : 2,438
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       09 May 2018 #23

    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:

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

    You should get the result as follows:
    Click image for larger version. 

Name:	p1.jpg 
Views:	2 
Size:	140.6 KB 
ID:	187939

    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 ComputerSystem Spec

  4.    14 May 2018 #24

    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

    Done.
      My ComputerSystem Spec

  5.    23 May 2018 #25

    Hello,
    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 ComputerSystem Spec

  6.    23 May 2018 #26

    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 ComputerSystem Spec

  7.    23 May 2018 #27

    AndreTen said: View Post
    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 ComputerSystem Spec


 
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