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I once had partition table like:

Recovery:EFI System Part: C

Then I installed Ubuntu to dual boot. Windows 10 update then clobbered Grub (I guess) and Ubuntu install was rendered useless. Now I just want my disk space back as above Recovery:EFI System Part: C

Somehow this 825MB NTFS Healthy OEM Partition has been moved into place...so now I can't just expand my C: partition to use unallocated space.

Is there anything I can do here? Windows Disk Mgmt won't let me delete the 825MB partition!

enter image description here

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    You can delete the OEM partition outside of Windows.. You should simply be able to install Ubuntu to the unallocated space. GPT does not have the same restrictions that MBR has.
    – Ramhound
    Commented May 2, 2019 at 12:06
  • @Ramhound Would love to have Ubuntu running but right now but I'm just trying to recover my Windows disk space.
    – chrips
    Commented May 2, 2019 at 13:23
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    The partition you are attempting to delete always existed. You likely had two partitions one for the system and for data originally. That is typically the OEM partition layout.
    – Ramhound
    Commented May 2, 2019 at 13:33
  • Yes, it must have been always there. Partitions aren't "moved into place". And no matter what the Windows update did, in a UEFI system you can always change the boot order back to Ubuntu (Grub). I suggest you learn a bit more about this things so to avoid misconceptions and doing something you'll later regret.
    – user931000
    Commented May 2, 2019 at 14:26
  • @Ramhound I partitioned the disk myself so this is a real mystery. Those 338 and 107Gig partitions used to be one partition I swear! I shrunk the C partition and then used the 107GB for Ubuntu. I'm really quite certain the ~800MB partition is new.
    – chrips
    Commented May 3, 2019 at 6:16

1 Answer 1

Reset to default
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Running

reagentc /info

shows that 825MB partition is selected as the recovery partition. I know the partition is new in the last 6 months and it has been suggested a Windows update did this.

Sticking the recovery partition between my system partition and the rest of the disk is a total No-Go. I've never once needed to use Recovery mode anyway.

I deleted the partition by running:

diskpart

list disk

select disk 0 (As seen in the picture above.)

list partition

select partition 5 (The one indicated by reagentc /info)

gpt attributes=0x8000000000000000 (Unlocks partition for deletion)

delete partition

Then I could head into Disk Management and Expand my C drive to use the rest of the volume like it once was.

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  • "delete partition override" will spare us from having to set the gpt attribute.
    – gbarry
    Commented Feb 4, 2020 at 0:42

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