In Windows 10 1703 update, Microsoft added MBR2GPT command line tool, that lets you convert your system disk’s partition table from MBR to GPT. 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. Unfortunately, it didn’t work for me as I always got “Cannot find OS partition” error.

C:\Windows\system32>MBR2GPT.EXE /convert /allowfullos

MBR2GPT will now attempt to convert the default book disk.
If conversion is successful the disk can only be booted in GPT mode.
These changes cannot be undone! …

Michał Jakubowski

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