The volume IDs can be retrieved for each volume that has a drive letter assigned.The BCD store on the system partition contains a default OS entry pointing to an OS partition.The disk doesn't have any extended/logical partition.One of the partitions is set as active and is the system partition.There are at most three primary partitions in the MBR partition table.

Disk Prerequisitesīefore any change to the disk is made, MBR2GPT validates the layout and geometry of the selected disk to ensure that:

Make sure that your device supports UEFI before attempting to convert the disk.

After the disk has been converted to GPT partition style, the firmware must be reconfigured to boot in UEFI mode.