MBR to GPT Partition Problems

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  1. Posts : 18,424
    Windows 11 Pro
       #11

    You need a command prompt with admin privileges. The first command prompt you opened did not have admin privileges. The bcdboot command needs to be run in command prompt (or powershell) with admin, "Run as Administrator". The C: drive needs more than just to be an active partition, it also needs the boot files created on it, which is what the bcdboot command does.

    Then you need to go into BIOS settings and set disk 2 as the first boot device in the boot priorities list.

    Once you actually boot the computer from disk 2, it will get the "system" tag, and then mbr2gpt will work on it.
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  2. Posts : 12
    Windows 10
    Thread Starter
       #12

    NavyLCDR said:
    You need a command prompt with admin privileges. The first command prompt you opened did not have admin privileges. The bcdboot command needs to be run in command prompt (or powershell) with admin, "Run as Administrator". The C: drive needs more than just to be an active partition, it also needs the boot files created on it, which is what the bcdboot command does.

    Then you need to go into BIOS settings and set disk 2 as the first boot device in the boot priorities list.

    Once you actually boot the computer from disk 2, it will get the "system" tag, and then mbr2gpt will work on it.
    Okay were getting somewhere now, but I still cant do mbr2gpt its greyed out, maybe i'll try it in command line

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  3. Posts : 18,424
    Windows 11 Pro
       #13

    What are the results of:

    Code:
    mbr2gpt /validate /allowfullos
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  4. Posts : 12
    Windows 10
    Thread Starter
       #14

    NavyLCDR said:
    What are the results of:

    Code:
    mbr2gpt /validate /allowfullos
    PS C:\Windows\system32> mbr2gpt /validate /allowfullos
    MBR2GPT: Attempting to validate disk 2
    MBR2GPT: Retrieving layout of disk
    MBR2GPT: Validating layout, disk sector size is: 512 bytes
    MBR2GPT: Validation completed successfully

    but then if I try and do the mbr2gpt this is what I get:

    PS C:\Windows\system32> mbr2gpt /convert /disk:2 /allowfullos

    MBR2GPT will now attempt to convert disk 2.
    If conversion is successful the disk can only be booted in GPT mode.
    These changes cannot be undone!

    MBR2GPT: Attempting to convert disk 2
    MBR2GPT: Retrieving layout of disk
    MBR2GPT: Validating layout, disk sector size is: 512 bytes
    MBR2GPT: Trying to shrink the OS partition
    MBR2GPT: Creating the EFI system partition
    Cannot create EFI system partition. Error: 0x000036B7
    MBR2GPT-undo: Extending back the OS partition
    MBR2GPT: Conversion failed

    I hold shift and hit reset trying to get the advanced recovery menu so I can select command prompt and try there, but I lost all my options, when I hit advanced startup settings it just says restart to get access to safemode safemode with networking etc so I think maybe some of my windows system files are missing?
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  5. Posts : 18,424
    Windows 11 Pro
       #15

    What results do you get from:
    Code:
    reagentc /enable
    reagentc /info
    There was a thread here earlier about mbr2gpt failing because Windows RE (Recovery Environment) was broken.
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  6. Posts : 12
    Windows 10
    Thread Starter
       #16

    NavyLCDR said:
    What results do you get from:
    Code:
    reagentc /enable
    reagentc /info
    There was a thread here earlier about mbr2gpt failing because Windows RE (Recovery Environment) was broken.
    PS C:\Windows\system32> reagentc /enable
    REAGENTC.EXE: Unable to update Boot Configuration Data.

    PS C:\Windows\system32> reagentc /info
    Windows Recovery Environment (Windows RE) and system reset configuration
    Information:

    Windows RE status: Disabled
    Windows RE location:
    Boot Configuration Data (BCD) identifier: 2d2dd127-0427-11ec-947c-ae79bbb84511
    Recovery image location:
    Recovery image index: 0
    Custom image location:
    Custom image index: 0

    REAGENTC.EXE: Operation Successful.
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  7. Posts : 18,424
    Windows 11 Pro
       #17

    I would try booting from a Windows 10 USB flash drive, press shift + F10 to get a command prompt. Then you will need to run:
    Code:
    diskpart
    list vol
    exit
    to see which drive letter your Windows on disk 2 has. Let's say it is E:. Then would run:
    E:\Windows\System32\mbr2gpt /disk:2 /convert

    Assuming your disk numbers stayed the same.

    You could also try a repair install of your Windows:
    Repair Install Windows 10 with an In-place Upgrade
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  8. Posts : 12
    Windows 10
    Thread Starter
       #18

    NavyLCDR said:
    I would try booting from a Windows 10 USB flash drive, press shift + F10 to get a command prompt. Then you will need to run:
    Code:
    diskpart
    list vol
    exit
    to see which drive letter your Windows on disk 2 has. Let's say it is E:. Then would run:
    E:\Windows\System32\mbr2gpt /disk:2 /convert

    Assuming your disk numbers stayed the same.

    You could also try a repair install of your Windows:
    Repair Install Windows 10 with an In-place Upgrade
    So I used powershell as admin initially to run reagentc /enable I just used command prompt as admin and it succeeded

    C:\Windows\system32>reagentc /enable
    REAGENTC.EXE: Operation Successful.


    C:\Windows\system32>reagentc /info
    Windows Recovery Environment (Windows RE) and system reset configuration
    Information:

    Windows RE status: Enabled
    Windows RE location: \\?\GLOBALROOT\device\harddisk2\partition1\Recovery\WindowsRE
    Boot Configuration Data (BCD) identifier: 290ce62e-7c89-11ec-9410-001a7dda7113
    Recovery image location:
    Recovery image index: 0
    Custom image location:
    Custom image index: 0

    REAGENTC.EXE: Operation Successful.
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  9. Posts : 18,424
    Windows 11 Pro
       #19

    Good! Now try mbr2gpt.
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  10. Posts : 12
    Windows 10
    Thread Starter
       #20

    NavyLCDR said:
    Good! Now try mbr2gpt.
    I was able to use mbr2gpt, but I got this error: MBR2GPT: Failed to update ReAgent.xml, please try to manually disable and enable WinRE.

    I restarted my PC changed boot mode to UEFI only in bios and I am currently running GPT based on what disk manager drive properties are saying.

    When I held shift and hit restart I do have all my advanced options back like startup repair startup settings command prompt uefi firmware settings etc etc. Can I now get rid of my 2gb unallocated partition? How would I even do that?

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