If conversion is successful the disk can only be booted in GPT mode.
C:\Windows\system32>MBR2GPT.EXE /convert /allowfullos MBR2GPT will now attempt to convert the default book disk. Unfortunately, it didn’t work for me as I always got “Cannot find OS partition” error. In general, this is done, so that Windows can boot in modern UEFI mode instead of old BIOS mode and to support disks bigger than 2 TB. In Windupdate, Microsoft added MBR2GPT command line tool, that lets you convert your system disk’s partition table from MBR to GPT.
