Forum Discussion
MBR2GPT Disk layout validation failed
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
If you are trying convert a disk with operating system installed on it should boot properly with legacy boot mode then only converting MBR to GPT will work and just having unallocated space will not convert but disk should be bootable in legacy mode fist .
Existing OS (MBR) disk will have system reserved partition and OS partition ..
Please use migration software to take copy of existing OS disk and then convert.
MBR to GPT there will not be any data loss but reverse it-> you need delete the entire volume
backup your data before proceeding.
All the best
Regards,
samy