Windows 10: No MSR partition after converting from MBR to GPT a while back?

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  1.    27 Nov 2017 #11

    topgundcp said: View Post
    Sorry but this is incorrect. It does not mean if Minitool can't do it then no other software can do it.
    Since I know you use Macrium and I can tell you that Macrium can do things that Minitool is unable to.

    @iarejohnsmith
    Even lots of people claim that you don't need it and they don't have any clear explanation for it except Windows will work without it and I am not going to debate about this. However, every time you initialize a GPT disk, there will be an MSR partition created and MS also state that this partition is needed for partition management of a GPT disk, Now who should I believe other than the creator of Windows.

    With a fresh install of Windows 10 version 1709. The partition layout is: 500MB Recovery, 100MB EFI partition, 16MB MSR and the rest is C drive.
    If you keep it in this layout, you won't have any problem for future feature update, otherwise you would see a lot of extra Recovery partitions created even though Windows is still working.

    Honestly, I don't see how by deleting a 16MB partition will save any space. Surfing the internet will create cache files left and right in order of several hundred MB's in one session.

    If you are interested in rebuilding the partitions so it look as if you do a fresh install then let us know.
    Yeah I knew MRF could do it in effect, but you are deleting and restoring rather than moving using a partition manager moving functions.

    Re. MSR needed - that is not a requirement of the minimum UEFI standard, so MS have to comply with minimum and allow Windows to work with only two partitions, EFI and OS drive.
      My ComputerSystem Spec

  2.    27 Nov 2017 #12

    Superfly said: View Post
    Yup. I think Windows Update uses the MSR - I would leave it be as well....not sure why it's so small though - maybe just for temp boot files?
    MSR is not part of minimum UEFI standard, so pc has to work even without it. I have deleted on various devices for years and things still work. It is not used now for sure.
      My ComputerSystem Spec

  3.    27 Nov 2017 #13

    cereberus said: View Post
    MSR is not part of minimum UEFI standard, so pc has to work even without it. I have deleted on various devices for years and things still work. It is not used now for sure.
    M, you guys are the experts ... just IMHO.. :)
      My ComputerSystem Spec


  4. Posts : 17,855
    windows 10 professional version 1607 build 14393.969 64 bit
       27 Nov 2017 #14

    If a computer does not have MSR and or has reduced space in the EFI it will likely have problems upgrading.
    Upgrades come approximately every 6 months so there is a significant period of time in which there are no problems detected.
    The OP could use the computer without upgrades too.
    So to have a smooth working computer the MSR and EFI are needed to have a certain amount of free space to perform the upgrades.
    If an OP chooses to work without these they can as long as they have a backup image.
    With a backup image they can clean install the new version and build of windows and restore the image and have the upgrade.
      My ComputerSystem Spec

  5.    27 Nov 2017 #15

    topgundcp said: View Post
    If you are interested in rebuilding the partitions so it look as if you do a fresh install then let us know.
    Hey, I am definitely interested in this!

    Basically I have two issues right now:
    1. I am missing the MSR partition entirely (likely due to fact that I did an MBR to GPT conversion via DiskPart after Windows installation).
    2. The partitions are out of order (current order is C, recovery 1, D, EFI, recovery 2) and I don't know how to rearrange them. I realized today this is a big problem when I formatted the second recovery partition but couldn't give the new space to C or D because the EFI partition is in the way.

    Any suggestions on approaching these issues?
      My ComputerSystem Spec


  6. Posts : 2,422
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       27 Nov 2017 #16

    Any suggestions on approaching these issues?
    Yes, we will rebuild the whole thing.

    Here's the steps:
    1. Copy this code and save it in a file called: EFI.txt to an external HD.
      IMPORTANT: The code uses Disk 0 on first line, make sure you use the same disk #, if not, change it.
      select disk 0
      clean
      convert GPT
      create partition primary size=499
      format quick fs=ntfs
      set id=DE94BBA4-06D1-4D40-A16A-BFD50179D6AC override
      gpt attributes=0x8000000000000001
      create partition primary size=99
      format quick fs=FAT32
      set id=C12A7328-F81F-11D2-BA4B-00A0C93EC93B override
      create par MSR size=16
      list par
      exit
    2. Download Macrium Rescue disk ISO.: MacRescue.iso - Google Drive
      build a bootable USB, use: Rufus - Create bootable USB drives the easy way
    3. Boot up the PC with the USB. NOTE: there are 2 boot up modes: USB-XXX and UEFI-USB-XXX
      Since your Windows is GPT, Must use: UEFI-USB-XXX
    4. Make a complete backup image of your current Windows Disk 0 including D: partition to the external HD.
      (Click on image this disk)
      IMPORTANT:
      Make sure you verify the image
    5. Next, Click on the command icon on the bottom left to open the command windows then type:
      diskpart /s Drive:\EFI.txt where Drive is the the drive letter of the external HD.
      This will create the 1st 3 partitions: 500MB Recovery, 100MB EFI System, 16MB MSR
    6. Go back to Macrium Windows, click on Backup tab, click on Refresh
    7. Next, click on Restore Tab and select the backup image created in step 4
      Select the destination disk (Disk 0)
    8. Drag the Cdrive from top row and drop to the empty space next to 16MB MSR, then drag D: and drop next to C:
      Click next->Finish
    9. Once restore completed. Click on "Fix Windows Boot problem". Follow the screen to rebuild the BCD.
    10. Reboot


    You should have: 499 MB Recovery, 99 EFI System, 16MB MSR and C drive + Drive (16MB MSR is hidden from Disk Management)
    Here's a screen shot without Drive D since I only have Windows partitions on disk 0
    Click image for larger version. 

Name:	p1.jpg 
Views:	2 
Size:	40.1 KB 
ID:	165764

    At this point your Windows Recovery Environment is broken, we will fix that next.

    If you have any question. Please ask !!!
    Last edited by topgundcp; 27 Nov 2017 at 09:02.
      My ComputerSystem Spec

  7.    27 Nov 2017 #17

    I find it hilarious to think that Windows update/upgrade will fail because there is not a 16MB empty partition on the hard drive. ROFLMAO!

    Especially when there is no such partition possible on an MBR partitioned drive.
      My ComputerSystem Spec

  •    27 Nov 2017 #18

    topgundcp said: View Post
    Yes, we will rebuild the whole thing.

    Here's the steps:
    1. Copy this code and save it in a file called: EFI.txt to an external HD.
      IMPORTANT: The code uses Disk 0 on first line, make sure you use the same disk #, if not, change it.
      select disk 0
      clean
      convert GPT
      create partition primary size=499
      format quick fs=ntfs
      set id=DE94BBA4-06D1-4D40-A16A-BFD50179D6AC override
      gpt attributes=0x8000000000000001
      create partition primary size=99
      format quick fs=FAT32
      set id=C12A7328-F81F-11D2-BA4B-00A0C93EC93B override
      create par MSR size=16
      list par
      exit
    2. Download Macrium Rescue disk ISO.: MacRescue.iso - Google Drive
      build a bootable USB, use: Rufus - Create bootable USB drives the easy way
    3. Boot up the PC with the USB. NOTE: there are 2 boot up modes: USB-XXX and UEFI-USB-XXX
      Since your Windows is GPT, Must use: UEFI-USB-XXX
    4. Make a complete backup image of your current Windows Disk 0 including D: partition to the external HD.
      (Click on image this disk)
      IMPORTANT:
      Make sure you verify the image
    5. Next, Click on the command icon on the bottom left to open the command windows then type:
      diskpart /s Drive:\EFI.txt where Drive is the the drive letter of the external HD.
      This will create the 1st 3 partitions: 500MB Recovery, 100MB EFI System, 16MB MSR
    6. Go back to Macrium Windows, click on Backup tab, click on Refresh
    7. Next, click on Restore Tab and select the backup image created in step 4
      Select the destination disk (Disk 0)
    8. Drag the Cdrive from top row and drop to the empty space next to 16MB MSR, then drag D: and drop next to C:
      Click next->Finish
    9. Once restore completed. Click on "Fix Windows Boot problem". Follow the screen to rebuild the BCD.
    10. Reboot


    You should have: 499 MB Recovery, 99 EFI System, 16MB MSR and C drive + Drive (16MB MSR is hidden from Disk Management)
    Here's a screen shot without Drive D since I only have Windows partitions on disk 0
    Click image for larger version. 

Name:	p1.jpg 
Views:	2 
Size:	40.1 KB 
ID:	165764

    At this point your Windows Recovery Environment is broken, we will fix that next.

    If you have any question. Please ask !!!
    Dude, this is perfect, thanks so much for the guide! It'll be a couple weeks before I can try it out, but I'll def update here once I do it (as long as the computer still boots).
      My ComputerSystem Spec


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