I am trying to convert a Windows 10 Enterprise VM from BIOS boot to EFI/UEFI. After extensive research I found the built-in "MBR2GPT" tool that MS released with Fall Creators Update: https://docs.microsoft.com/en-us/windows/deployment/mbr-to-gpt
However, when I boot to the Win10 ISO (so WinPE) and try to run the "MBR2GPT .exe" tool it fails:
E:\Windows\System32>mbr2gpt /convert MBR2GPT: Attempting to validate disk 0 MBR2GPT: Retrieving layout of disk MBR2GPT: Validating layout, disk sector size is: 512 byes Cannot find OS partition(s) for disk 0
I run DISKPART first to ensure the OS disk is indeed disk 0. I'm desperate for a solution here as we have almost 20 machines to image and are up against a hard deadline. Help greatly appreciated!