Mar 23 2018 09:26 AM
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 layout, disk sector size is: 512 bytes
Disk layout validation failed for disk 0
I read a bit about it, and it seems to not work because disk 0 isnt a system disk, but in my case it is.
I am using build 1709
Mar 31 2020 10:29 PM
I got the same error when attempting to use the mbr2gpt tool on my disk0; any ideas what could have caused it?
C:\WINDOWS\system32>mbr2gpt /validate /allowFullOSMBR2GPT:
Attempting to validate disk 0MBR2GPT:
Retrieving layout of diskMBR2GPT:
Validating layout, disk sector size is: 512 bytes
Disk layout validation failed for disk 0
Apr 02 2020 07:28 AM
@Aaron B Boot with USB windows 10 PE, and then try to enter below command
mbr2gpt.exe /validate /disk:0
mbr2gpt.exe /convert /disk:0
Note once conversion formats all partitions in the Disk 0 , you wont be able recover anydatas .
for more information, visit below page
**https://docs.microsoft.com/en-us/windows/deployment/mbr-to-gpt**
Apr 02 2020 02:03 PM
@RAJUMATHEMATICSMSC This is not what i wanted, i wanted to convert the disk while keeping all of my stuff. (See the /allowFullOS switch)
Apr 02 2020 02:03 PM - edited Apr 02 2020 02:04 PM
Ill unsubscribe from this because its 2 years old and i no longer require assistance with this.
Jul 21 2021 07:20 AM
Jul 21 2021 07:21 AM
Sep 22 2021 08:55 AM
Oct 02 2021 12:15 PM
I did not work for me. My system drive is on disk 1 and not disk 0. Maybe that is the reason why.
Oct 02 2021 12:23 PM
Oct 02 2021 12:32 PM - edited Oct 02 2021 12:34 PM
I am afraid it did not. I used the following command to no avail:
mbr2gpt/disk:1 /validate /allowFullOS
and I still get that the validation of disk 1 failed.
edit: I also shrank the drive first by 200MB, and then by 2GB, and that did not work either.
Oct 02 2021 12:41 PM
Oct 02 2021 12:49 PM - edited Oct 02 2021 01:02 PM
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.
Oct 02 2021 01:45 PM
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.
Oct 02 2021 02:21 PM
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.
Oct 06 2021 04:38 AM
Oct 06 2021 10:45 AM
I have tried this 3 times with 3 fails.
C:\WINDOWS\system32>mbr2gpt /validate /allowfullos
MBR2GPT: Attempting to validate disk 0
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Disk layout validation failed for disk 0
C:\WINDOWS\system32>mbr2gpt.exe /convert /allowfullos
MBR2GPT will now attempt to convert the default book disk.
If conversion is successful the disk can only be booted in GPT mode.
These changes cannot be undone!
MBR2GPT: Attempting to convert disk 0
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Disk layout validation failed for disk 0
Oct 06 2021 12:08 PM
Oct 06 2021 12:55 PM