Reserved partition not shown in Disk Manager

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  1. Posts : 449
    Windows 10 Home 64bit 21H2 OS 19044.1466
       #1

    Reserved partition not shown in Disk Manager


    My spare pc with Windows 10 Home which I only use as a test pc seems to have lost the reserved partition as screenshot below shows. Windows boots as normal and the pc works fine but should I reinstall Windows?
    Reserved partition not shown in Disk Manager-2021-12-01_16-58-56.jpg
      My Computers

  2. dalchina's Avatar
    Posts : 34,305
    Win 10 Pro (1903) (2nd PC is 21H2)
       #2

    As you can see, it's not shown by default by Disk Management.
    Reserved partition not shown in Disk Manager-1.jpg
      My Computers


  3. Posts : 449
    Windows 10 Home 64bit 21H2 OS 19044.1466
    Thread Starter
       #3

    I just happened to notice it today, so nothing to worry about
      My Computers

  4. Bree's Avatar
    Posts : 22,791
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #4

    scopio said:
    My spare pc with Windows 10 Home which I only use as a test pc seems to have lost the reserved partition as screenshot below shows. Windows boots as normal and the pc works fine but should I reinstall Windows?
    What makes you think you should have a System Reserved partition? Non of my UEFI/GPT machines have one.

    Reserved partition not shown in Disk Manager-image.png

    A System Reserved partition is only ever used on a Legacy MBR install where it is marked as Active and is the boot partition, that's the job of the EFI partition in a UEFI install.

    Reserved partition not shown in Disk Manager-image.png

    As this is a test machine, could the 500MB unallocated space have been a leftover from a previous test? It's not needed or used for a UEFI install.
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  5. Posts : 449
    Windows 10 Home 64bit 21H2 OS 19044.1466
    Thread Starter
       #5

    Possibly a left over from a previous test.
    The question now is can the unallocated partition be extended to the C: partition and if so how?
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  6. Bree's Avatar
    Posts : 22,791
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #6

    scopio said:
    Possibly a left over from a previous test.
    The question now is can the unallocated partition be extended to the C: partition and if so how?

    Yes, but AFAIK Disk Management can only extend the C: partition to unallocated space to the right. You'd could use something like MiniTool Partition Wizard to extend it to the left.

    There is also the question of where the small MSR partition is located. Disk Management hides it from view, if it's between C: and the unallocated space you can't extend C:.

    Microsoft Reserved Partition - Wikipedia

    Partition Wizard will show it, while Disk Management won't.

    Reserved partition not shown in Disk Manager-image.png
      My Computers


  7. Posts : 449
    Windows 10 Home 64bit 21H2 OS 19044.1466
    Thread Starter
       #7

    Tried to extend the C: drive by the amount of the unallocated partition with MiniTool Partition Wizard (Paid version) it goes through its motion but it does not extend the C: drive!
    Reserved partition not shown in Disk Manager-2021-12-01_21-43-40.jpg
    Reserved partition not shown in Disk Manager-2021-12-01_21-46-47.jpg
    Reserved partition not shown in Disk Manager-2021-12-01_21-47-38.jpg
    Reserved partition not shown in Disk Manager-2021-12-01_21-48-13.jpg
    Result
    Reserved partition not shown in Disk Manager-2021-12-01_22-28-19.jpg
      My Computers

  8. Berton's Avatar
    Posts : 12,289
    Win10 Version 21H2 Pro and Home, Win11 Pro
       #8

    The internal drive on my factory ASUS machine, as shown in the top panel there's other USB drives:
    Reserved partition not shown in Disk Manager-image.png
      My Computers

  9. steve108's Avatar
    Posts : 19,599
    19041.1466 - 2004/20H1 Pro x64
       #9

    scopio said:
    Tried to extend the C: drive by the amount of the unallocated partition with MiniTool Partition Wizard (Paid version) it goes through its motion but it does not extend the C: drive!
    Reserved partition not shown in Disk Manager-2021-12-01_21-43-40.jpg
    Reserved partition not shown in Disk Manager-2021-12-01_21-46-47.jpg
    Reserved partition not shown in Disk Manager-2021-12-01_21-47-38.jpg
    Reserved partition not shown in Disk Manager-2021-12-01_21-48-13.jpg
    Result
    Reserved partition not shown in Disk Manager-2021-12-01_22-28-19.jpg
    Use the Restart Now option.
      My Computer


  10. Posts : 449
    Windows 10 Home 64bit 21H2 OS 19044.1466
    Thread Starter
       #10

    That's exactly what I did but it did not extend the C: drive!
      My Computers


 

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