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Resolving converting MBR to GBT converting boot issue
I'm trying to upgrade Windows10 (Build: 21H1) to Windows11 since I have to convert the MBR to GBT that is where the issue begins. I've tried to do this both online and offline to no success.
This is the error which I get related to someone else had on this page but only when attempting to do the conversion using mbr2gbt offline using a Windows rescue disk in command prompt. When I attempt to do the conversion online, that is within Windows, this is the error code I get;
I prefer to do this offline, but based on this page and this page, the solutions seem to fall into my situation but not exactly. The second link which was just posted, makes me wonder if the boot is spread out over two disks, not that is may be for my situation but it was mentioned ?Code:MBR2GPT: Attempting to convert disk 3MBR2GPT: Retrieving layout of diskMBR2GPT: Validating layout, disk sector size is: 512 bytesMBR2GPT: Trying to shrink the OS partitionMBR2GPT: Creating the EFI system partitionCannot create EFI system partition. Error: 0x000036B7 MBR2GPT-undo: Extending back the OS partition MBR2GPT: Conversion failed
Therefore I understand when doing the conversion offline diskpart is a necessity; it's just knowing what has done wrong with my particular boot that the conversion isn't smooth and how to convert it and fix the boot issues so that it will convert. All this while not loosing any data as mbr2gbt is capably off; although I know a backup prior to doing this is important.