After W7 to W10 upgrade - 2 MSR partitions

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  1. TV2
    Posts : 2,221
    W10 Pro 22H2
       #1

    After W7 to W10 upgrade - now 2 Recovery Partitions


    I recently helped someone upgrade their system from Windows 7 to Windows 10 remotely.
    They are now running Windows 10 1909.

    Looking a Disk Management there are now 2 MSR (OEM Partition).
    After W7 to W10 upgrade - 2 MSR partitions-pdnphaclfleggobk.png

    I do not recall creating the EFI System partition or the MSR partitions when we first clean installed Windows 7 in 2014. But it has been far too long for me to remember.

    Also note: we had a glitch upgrading. This resulted in upgrading, restoring the W7 image backup, upgrading again. Which may explain the 2 MSR partitions.

    Questions:
    Can we delete one of these partitions?
    If so, how do we tell which one?

    Other questions:
    Will a Windows 10 Upgrade on an UEFI system create the EFI and MSR partitions on it's own?
    Even if the original Windows 7 installation was done with BIOS set to "Other OS"?
    Last edited by TV2; 20 Jan 2020 at 12:45.
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  2. Posts : 43,204
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #2

    An easy way to tell which Recovery partition ('OEM') - which is what those are- is being used is to determine which is the more recent.
    Here's Minitool Partition Wizard: look at the date.
    After W7 to W10 upgrade - 2 MSR partitions-1.png

    Otherwise you can use these commands: here you can see partition 5 is in use.
    After W7 to W10 upgrade - 2 MSR partitions-2.pngAfter W7 to W10 upgrade - 2 MSR partitions-3.png

    Win 10 will of course create the partitions appropriate to its environment - UEFI or MBR. It will be interesting to see what others say about your presumed UEFI configuration.
    Last edited by dalchina; 20 Jan 2020 at 10:55.
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  3. Posts : 18,433
    Windows 11 Pro
       #3

    Looks like a standard UEFI setup except the two partitions in question are not MSR partitions. The MSR partition is a small, likely 16MB partition that should be between the EFI System Partition and the boot (OS) partition. It does not show up in disk management. The extra recovery partition is a fairly common occurrence. After finding the active recovery partition using reagentc/info, the other recovery partition can be deleted. But don't forget, when counting the partition numbers, you have to add in the real, hidden MSR partition. So the boot (OS) partition is very likely to be partition #3, not 2.

    Notice that the two recovery partitions are, in fact, numbered 4 and 5.
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  4. Posts : 6,396
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #4

    In Win 7 the MSR partition (120M) was only used on Ultimate version to have the Bitlocker decryption. On the other versions (HB, HP and Pro) it is useless.
    What is the Win 10 MSR partition (16M) for?
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  5. Posts : 41,534
    windows 10 professional version 1607 build 14393.969 64 bit
       #5

    1) Open administrative command prompt and copy and paste: (all at one time)

    Code:
    bcdedit /enum all
    reagentc /info
    diskpart
    lis dis
    lis vol
    sel dis 0
    det dis
    lis par
    sel par 1
    det par
    sel par 2
    det par
    sel par 3
    det par
    sel par 4
    det par
    sel par 5
    det par
    sel par 6
    det par
    sel dis 1
    det dis
    lis par
    sel par 1
    det par
    sel par 2
    det par
    sel par 3
    det par
    sel par 4
    det par
    sel par 5
    det par
    sel par 6
    det par
    2) When these have completed > right click on the top bar or title bar of the administrative command prompt box > left click on edit then select all > right click on the top bar again > left click on edit then copy > paste into the thread


    Megahertz said:
    What is the Win 10 MSR partition (16M) for?
    Microsoft reserved partition (MSR)

    Beginning in Windows 10, the size of the MSR is 16 MB.
    Add an MSR to each GPT drive to help with partition management.
    The MSR is a reserved partition that does not receive a partition ID.
    It cannot store user data.

    https://docs.microsoft.com/en-us/win...ive-partitions
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  6. TV2
    Posts : 2,221
    W10 Pro 22H2
    Thread Starter
       #6

    Hi all. Thanks for all the info on this. As noted, I am working with this user remotely across the country, so there will be a time delay between suggestions and action. I'll keep y'all posted.

    Upon further thought, it is entirely possible I set up this rig for UEFI BIOS when installing Windows 7. Sounds like something I would do just because I could. It probably just had 2 partitions: the EFI System Partition and C: on the original installation.
      My Computers


  7. TV2
    Posts : 2,221
    W10 Pro 22H2
    Thread Starter
       #7

    dalchina said:
    Otherwise you can use these commands: here you can see partition 5 is in use.
    After W7 to W10 upgrade - 2 MSR partitions-2.pngAfter W7 to W10 upgrade - 2 MSR partitions-3.png
    Not sure how I "see" that partition 5 is in use.
    Is it because it has 237GB in the Offset column?
    Or because of something I'm looking at in reagentc /info?

    EDIT: Ah, I see it now.
    Thank You!
      My Computers


  8. Posts : 43,204
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #8

    Partition 5 in 1st is a Recovery partition.

    In the 2nd, P 5 is given as the active Recovery partition.

    Hence you can see that P5 of 651Mb is the active Recovery partition.

    QED.
      My Computers


  9. Posts : 41,534
    windows 10 professional version 1607 build 14393.969 64 bit
       #9

    See Windows RE location displaying harddisk0, partition5
    the status displayed enabled
      My Computer


  10. TV2
    Posts : 2,221
    W10 Pro 22H2
    Thread Starter
       #10

    Yes, I see it now. Blindness!
    Thank You.
      My Computers


 

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