Windows 10: New 1803 version created a new disk partition - Can I reclaim it?

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  1. Posts : 132
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
       01 May 2018 #1

    New 1803 version created a new disk partition - Can I reclaim it?


    Hi all,

    My SSD is short on space, it's 240GB.

    I've cleaned the new installation file using windows cleaner. However, I have a new partition which is 449MB.
    Under disk management, it shows as part of Disk 0 which is my C drive.
    It's description is 450MB NTFS, OEM Partition.

    Can I reclaim it back?

    Thanks.
      My ComputerSystem Spec

  2. slicendice's Avatar
    Posts : 3,561
    Windows 10 Pro x64 v1809 Build 17763.104 (Branch: RS5 Release Preview)
       01 May 2018 #2

    gil said: View Post
    Hi all,

    My SSD is short on space, it's 240GB.

    I've cleaned the new installation file using windows cleaner. However, I have a new partition which is 449MB.
    Under disk management, it shows as part of Disk 0 which is my C drive.
    It's description is 450MB NTFS, OEM Partition.

    Can I reclaim it back?

    Thanks.
    That is the partition where Windows 10 Recovery tools are located. I highly suggest you leave it alone, or you might break your whole system. I recommend you try to find another solution for getting more space on your HDD/SSD. An external USB-drive could be a really good option. Or maybe run a full disk-cleanup with Windows built in tools.
      My ComputersSystem Spec


  3. Posts : 132
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       01 May 2018 #3

    Hi.

    I did run a full disk cleanup.
    But this new partition never existed before. Are you saying that this is a new thing with the recent update?
      My ComputerSystem Spec

  4. slicendice's Avatar
    Posts : 3,561
    Windows 10 Pro x64 v1809 Build 17763.104 (Branch: RS5 Release Preview)
       01 May 2018 #4

    gil said: View Post
    Hi.

    I did run a full disk cleanup.
    But this new partition never existed before. Are you saying that this is a new thing with the recent update?
    No, it should have existed since initial Windows 10 install. All my computers has this partition.
      My ComputersSystem Spec


  5. Posts : 132
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       01 May 2018 #5

    I honestly say this was never there. maybe it was hidden and now it's not.
    But I know exactly how many drives and partitions I have.
    This is very strange.
      My ComputerSystem Spec

  6. slicendice's Avatar
    Posts : 3,561
    Windows 10 Pro x64 v1809 Build 17763.104 (Branch: RS5 Release Preview)
       01 May 2018 #6

    On an MBR formatted drive you should have 3 partitions and on and GPT (UEFI)formatted there should be four partitions.

    I suggest you leave them intact for best Windows reliability.
      My ComputersSystem Spec


  7. Posts : 132
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       01 May 2018 #7

    Click image for larger version. 

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    That's my current setup. It's GPT and has 3 partitions.
      My ComputerSystem Spec

  8.    01 May 2018 #8

    You can delete it and reclaim the space. Every function available from that partition is also available by booting from a Windows 10 installation flash drive or DVD. It's not going to be as easy as you think, though, because you also have a 4th partition in the way that does not appear in disk management - the Microsoft system reserved (MSR) partition. List the partitions using the diskpart command and you will see it.
      My ComputerSystem Spec


  9. Posts : 132
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       01 May 2018 #9

    NavyLCDR said: View Post
    You can delete it and reclaim the space. Every function available from that partition is also available by booting from a Windows 10 installation flash drive or DVD. It's not going to be as easy as you think, though, because you also have a 4th partition in the way that does not appear in disk management - the Microsoft system reserved (MSR) partition. List the partitions using the diskpart command and you will see it.
    So it's ok to just have two partitions of C drive and the 100MB EFI system partition?
      My ComputerSystem Spec

  10.    01 May 2018 #10

    gil said: View Post
    So it's ok to just have two partitions of C drive and the 100MB EFI system partition?
    That is debatable. Microsoft says the empty MSR partition is required. My computers run just fine without it. I think you need it if you plan to use Bitlocker. But you definitely do not need the 450mb "oem" partition which used to be called the recovery partition.
      My ComputerSystem Spec


 
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