Forum Discussion
MBR2GPT Disk layout validation failed
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**
RAJUMATHEMATICSMSC This is not what i wanted, i wanted to convert the disk while keeping all of my stuff. (See the /allowFullOS switch)
I was facing similar problem as my disk partition was in MBR format but I need it to be GPT format.
Disk validation failed.
Easiest way is solve this problem is as given below.
Go to Disk Manager -> Select disk (0 or 1 ) you want convert and select the partition eg. C -Drive
Right click --> Shrink the disk and put shrink value to 200MB ->OK
Go to CMD with admin mode run the below command
mbr2gpt /validate /disk:0 /allowFullOS -> Enter
Validation is success
Run below command to convert
mbr2gpt /convert /disk:0 /allowFullOS
Disk will be converted to GPT
Go to BIOS and change Legacy to UEFI mode and change boot sequence
Your system will boot with mfg logo
NO Data lossPalani Samy had to say thx I worked on this all day and though I read this fairly early on I kept looking for an easier way. This was it though.
Palani Samy I know this post was long ago. I'm having trouble with this. I'm really hoping someone out there can help out!
Background: Windows 10 Pro, use it as web server, need it working and online! Something happened, and it would not boot. Sabotage by someone out there wanting Bitcoin money. After hours of trying to diagnose, I used EasyRE Professional, and it worked. The system boots.
Now, however, I cannot make any backup (clone using Clonezilla). Clonezilla's error message states,
"The disk contains mismatched GPT and MBR partition: /dev/nvme0n1",
"It will confuse Clonezilla and might make the saved image useless or fail to close the disk."
and
"The directory for this inputted image name does NOT exist: /tmp/ocs_onthefly_scr.Pw91VG/d2d-pseudo"
etc. I know this is not a Clonezilla forum. But it seems to me that my system now boots form MBR and not GPT as it has always done previously.
In using MBR2GPT, I get the same error, "Disk layout validation failed for disk 0".
Maybe long-winded, but a little background.
Now the question - your advice states to shrink the drive c: to 200MB. But my entire OS, with website and everything else, is 141GB of 237GB. How could this be shrunk to 200MB?
I'll spend two weeks rebuilding my server if I screw this up, and I now have NO clone as a backup.
Hope someone can help! Thanks! -Allan
Palani, you're advice caused my windows 10 to corrupt, and for me to lose all of my C drive data as it corrupted as well. Thanks, for absolutely ruining most of my project files.
- This process should not corrupt your windows installation. You must have done something wrong.
Regardless, it is your responsibility to make sure you know what you are doing, and always take a backup before performing changes at this level.
Please learn to be respectful, we are all community members trying belp each other in absense of Microsoft.
Ill unsubscribe from this because its 2 years old and i no longer require assistance with this.
