16MB partition on newly installed non OS drive?


  1. Posts : 8
    Windows 10 Home
       #1

    16MB partition on newly installed non OS drive?


    Does anyone happen to know why Macrium Reflect shows my Crucial MX500 as having a 16MB partition when none of my other drives do with the exception of my OS drive?

    Conversely the partition in question doesn't appear Disk Management.

    Screenshot-2021-04-04-175902 — ImgBB
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  2. Berton's Avatar
    Posts : 10,489
    Win10 Pro Versions 2004 and 2009/20H2, Win10 Pro IP_Dev, Win10 Home 1909
       #2

    D3SOL4TE said:
    Does anyone happen to know why Macrium Reflect shows my Crucial MX500 as having a 16MB partition when none of my other drives do with the exception of my OS drive?
    Conversely the partition in question doesn't appear Disk Management.
    Screenshot-2021-04-04-175902 — ImgBB
    I probably don't have a solution but would ask if the drive in question was connected in the computer when Windows was installed? If so maybe it is a marker required by Wiindows, a test would be to unplug it then boot the computer just to see if it's required to be there. I did that once some time ago, removed the second or D: drive, couldn't boot and ended up with reinstalling with only the main drive connected.
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  3. Posts : 356
    Windows 10
       #3

    D3SOL4TE said:
    Does anyone happen to know why Macrium Reflect shows my Crucial MX500 as having a 16MB partition when none of my other drives do with the exception of my OS drive?

    Conversely the partition in question doesn't appear Disk Management.

    Screenshot-2021-04-04-175902 ImgBB
    MSR or Microsoft Reserved Partition, its standard on GPT disks. Search MSR for more info.
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  4. NavyLCDR's Avatar
    Posts : 15,503
    Windows 10 Pro
       #4

    Correct. MSR partition. Just delete it.
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  5. Posts : 8
    Windows 10 Home
    Thread Starter
       #5

    Berton said:
    I probably don't have a solution but would ask if the drive in question was connected in the computer when Windows was installed? If so maybe it is a marker required by Wiindows, a test would be to unplug it then boot the computer just to see if it's required to be there. I did that once some time ago, removed the second or D: drive, couldn't boot and ended up with reinstalling with only the main drive connected.
    No it wasn't connected when Windows was installed as I only just got it a couple of days ago and that aside I always unplug any additional drives when installing Windows.

    Anibor said:
    MSR or Microsoft Reserved Partition, its standard on GPT disks. Search MSR for more info.
    If that's the case (not doubting you) it's just strange it didn't occur with my other drives?
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  6. Megahertz's Avatar
    Posts : 2,383
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #6

    To post images, please don't use external links. Post them as attachment.
    How to Upload and Post Screenshots and Files at Ten Forums

    As Navy recommend, delete the partition.
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  7. Posts : 356
    Windows 10
       #7

    D3SOL4TE said:
    If that's the case (not doubting you) it's just strange it didn't occur with my other drives?
    It depends on the history of the disk. If you initialize a new disk as GPT, an MSR partition is created. The same if you do a clean install of Windows. If you "convert" an MBR disk to GPT, the process may not create an MSR. If you restore an image, the MSR may be overwritten by another partition.
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  8. NavyLCDR's Avatar
    Posts : 15,503
    Windows 10 Pro
       #8

    The "convert gpt" command in diskpart will create the partition.
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  9. Posts : 8
    Windows 10 Home
    Thread Starter
       #9

    Megahertz said:
    To post images, please don't use external links. Post them as attachment.
    How to Upload and Post Screenshots and Files at Ten Forums
    Sorry, I will in future. Thanks everyone for your help.
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