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Zachary-Cavanell's avatar
Zachary-Cavanell
Bronze Contributor
Apr 05, 2017

Shifting from BIOS to UEFI with the Windows 10 Creators Update MBR2GPT disk conversion tool

Comprehensive yet quick video overview that explains how you can safely and non-destructively convert a Windows 10 machine from legacy BIOS to UEFI disk partitioning; and how you can automate the con...
Windows 10
Lasse Gaardsholt's avatar
Lasse Gaardsholt
Copper Contributor
Apr 09, 2017
I get this error when trying to do the /validate
ValidateLayout: Wrong boot partition count, expected 1 but found 0.

Any idea why that is?
  • ftrout's avatar
    ftrout
    Brass Contributor
    Apr 09, 2017
    Just from the look of the error, it sounds like it cannot find a boot partition. How are you running the command?
    • Lasse Gaardsholt's avatar
      Lasse Gaardsholt
      Copper Contributor
      Apr 09, 2017
      mbr2gpt /disk:1 /validate

      I have tried from both WinPe and within Windows.

      This is the full transcript for the command prompt.

      C:\Windows\system32>mbr2gpt /disk:1 /validate /allowfullos /logs:c:\temp
MBR2GPT: Attempting to validate disk 1
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Disk layout validation failed for disk 1
      • ftrout's avatar
        ftrout
        Brass Contributor
        Apr 09, 2017
        Is there a reason your validating against disk 1? Try this:
        mbr2gpt /disk:0 /validate

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