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

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  1. gil
    Posts : 161
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
       #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 Computer

  2. slicendice's Avatar
    Posts : 4,644
    Windows 10 Pro x64 20H2 Build 19042.906 (Branch: Release Preview)
       #2

    gil said:
    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 Computers


  3. gil
    Posts : 161
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       #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 Computer

  4. slicendice's Avatar
    Posts : 4,644
    Windows 10 Pro x64 20H2 Build 19042.906 (Branch: Release Preview)
       #4

    gil said:
    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 Computers


  5. gil
    Posts : 161
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       #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 Computer

  6. slicendice's Avatar
    Posts : 4,644
    Windows 10 Pro x64 20H2 Build 19042.906 (Branch: Release Preview)
       #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 Computers


  7. gil
    Posts : 161
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       #7

    New 1803 version created a new disk partition - Can I reclaim it?-2018-05-02-00_22_58-.png

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

  8. NavyLCDR's Avatar
    Posts : 15,526
    Windows 10 Pro
       #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 Computer


  9. gil
    Posts : 161
    Microsoft Windows 10 Pro 64-bit 10586 Multiprocessor Free
    Thread Starter
       #9

    NavyLCDR said:
    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 Computer

  10. NavyLCDR's Avatar
    Posts : 15,526
    Windows 10 Pro
       #10

    gil said:
    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 Computer


 
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