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 ...
YvesVA's avatar
YvesVA
Copper Contributor
Nov 19, 2021

Thanks! It worked for me!

 

Must have 3 or less active partition. (unallocated space is no problem)

SalmanAhmed's avatar
SalmanAhmed
Iron Contributor
Nov 19, 2021

Hi YvesVA,

I'm glad that the above information was useful for you. Please do not hesitate to contact me for any further assistance, I will welcome the questions you may have.

  • NateRA's avatar
    NateRA
    Copper Contributor
    Nov 29, 2021

    HISalmanAhmed 

    received validation failed, read all 3 pages of posts since i'm doing this on production vm in business. Disk had 4 partitions, 1 boot, 1 system (c:) and 2 recovery partitions. Shrinking c: by 200mb didn't work. Deleting last partition (recovery partition) did work. Thanks. Not sure if it was too many partition or not having free space at end of drive.

    • VictorTsang's avatar
      VictorTsang
      Copper Contributor
      Nov 30, 2021

      NateRA 

      Removing the unneeded recovery partition might be all you need to do.  

      https://superuser.com/questions/1210470/multiple-recovery-partitions-in-windows-10

    • SalmanAhmed's avatar
      SalmanAhmed
      Iron Contributor
      Nov 30, 2021

      Hi NateRA 

      Thanks for the feedback!

      Unfortunately, MBR2GPT tool doesn't support more than three (3) partitions in the MBR partition table, and you should not have any extended/logical partition, all three partitions must be primary partition.

Resources