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Bob Arthur's avatar
Bob Arthur
Copper Contributor
Oct 28, 2021

Problems with partitions when using MBR2GPT

I'm not sure how to proceed to prepare for Windows 11. When running mbr2gpt, I get the following:   C:\WINDOWS\system32>mbr2gpt /validate /allowFullOS MBR2GPT: Attempting to validate disk 2 MBR2GP...
mbr2gpt
preparation
windows 10
windows 11
Bob Arthur's avatar
Bob Arthur
Copper Contributor
Oct 28, 2021

Thank you for responding SalmanAhmed! I very much appreciate your willingness to help.

So mbr2gpt is attempting to convert the original C drive (now G) and not finding an OS partition, even through Windows is installed on both the current C drive and the original C drive, which is now the G drive? I had thought it was going to change the disk with the OS currently being used (with the C and E partitions. That is why I was trying to delete the System Recovery for that drive, to get Disk 1 to three partitions.

I was moving to the 1 TB drive to make more room for the OS, but see that it has somehow filled up. I'm not sure how that happened but I suspect it may have to do with MS Flight Simulator having been installed (although the majority of its files should be on the E drive.

SalmanAhmed's avatar
SalmanAhmed
Iron Contributor
Oct 28, 2021

You're most welcomeBob Arthur ,

I've just noticed that there is no target disk specified in your mbr2gpt command, please execute as below in elevated (Run as Admin) mode in cmd:

mbr2gpt /validate /disk:2 /AllowFullOS
  • Bob Arthur's avatar
    Bob Arthur
    Copper Contributor
    Oct 28, 2021

     

    Here it is:

    C:\WINDOWS\system32>mbr2gpt /validate /disk:2 /AllowFullOS
MBR2GPT: Attempting to validate disk 2
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Cannot find OS partition(s) for disk 2

     

    • SalmanAhmed's avatar
      SalmanAhmed
      Iron Contributor
      Oct 28, 2021

      Hi Bob Arthur

      I would suggest you to boot your computer from the same disk (disk 2) by changing the boot order from the BIOS, and de-attach (or disable from the BIOS) all other disks, if possible. 

      • Bob Arthur's avatar
        Bob Arthur
        Copper Contributor
        Oct 28, 2021

        Disabled Disk 0 and Disk 1 in the Asus Bios. Changed Boot Order to boot from Disk 2 (500 mb disk).
        Windows presented the blue screen with the option to boot from either Windows or Windows Pro. I have been booting from the "Windows" option, so I chose Windows Pro this time.
        It then presented a light blue screen with the following:
        Recovery
        Your PC couldn't start properly
        After multiple tries the operating system on your PC failed to start so it needs to be repaired.
        Error Code: 0x0000001
        You'll need to use recovery tools ......(etc.)

        Press enter to try again
        Press F8 for Startup Settings
        Press F9 to use a different operating system

        If F8 is pressed, I get a light blue screen with ten different options. "Enable Logging" and "Boot into Safe Mode" made the most sense. I tried those. "Enable logging" results in starting again. "Boot into Safe Mode" allowed me to select either "Windows" or "Windows Pro" once again.

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