Forum Discussion

Aaron B's avatar
Aaron B
Copper Contributor
Mar 23, 2018

MBR2GPT Disk layout validation failed

When i try to run    mbr2gpt /validate /disk:0 /allowFullOS   i get the following output   MBR2GPT: Attempting to validate disk 0 MBR2GPT: Retrieving layout of disk MBR2GPT: Validating ...
Naeem86's avatar
Naeem86
Copper Contributor
Oct 02, 2021
I think there is issue with you syntax.

It should be

mbr2gpt /validate /disk:1 /allowfullos

There should be a space before each /

Make sure you running command prompt in administrator mode.
Odal53's avatar
Odal53
Copper Contributor
Oct 02, 2021

If it were a matter of syntax, it would have shown. I still did try it out
mbr2gpt /disk:1 /validate /allowFullos

and I started Dos as administrator. I wish someone from MS would react. As grateful as I am for your concern.

 

edit: according to AOMEI partition assistant, the boot partition and the system partition are on different disks and that I should not convert disk 1. I suppose I'll have to make the system disk as disk 0 to get any further.

I still would like to thank you for your contributions.

  • Alexander_Hoe's avatar
    Alexander_Hoe
    Copper Contributor
    Oct 06, 2021
    I have the same problem, but i got it on the HDD with Windows on it, the other 2 doesnt work
  • Odal53's avatar
    Odal53
    Copper Contributor
    Oct 02, 2021

    Naeem86 

    It is MBR. I think the only solution is a back up and a clean installation. When I disable the other boot options, my system drive does not boot. I can set up secure boot and TMP in the bios, but i must reinstall.

  • Naeem86's avatar
    Naeem86
    Copper Contributor
    Oct 02, 2021

    Odal53 

     

    i dont think its system partition issue. see the screen shot of my disk 0, which is my converted disk. it has system resevered, os and efi partitions + the 2gb un-allocated space.

     

    can you check and verify if your disk is mbr? I just did a validation and it failed as well. Im wondering if it fails once the drive is already converted to gpt.

     

    Heres link you can follow and try the conversion from preOS environment. its basically the recovery environment.

     

    https://www.windowscentral.com/how-convert-mbr-disk-gpt-move-bios-uefi-windows-10

     

    see if that helps.