Windows 10, version 1703 introduces a new tool, MBR2GPT, that enables you to convert a disk from Master Boot Record (MBR) to GUID Partition Table (GPT) partition style, without modifying or deleting data on the disk, as part of a migration from BIOS to UEFI.
Watch this demo to see the MBR2GPT tool in action:
Windows Program Manager, Desmond Lee, demonstrates the new MBR2GPT disk conversion tool that’s part of Windows 10 Creators Update. This is a comprehensive yet concise overview that explains how you can safely and non-destructively convert a Windows 10 machine from legacy BIOS to UEFI disk partitioning; and how you can automate the conversion as part of your in-place upgrade process from Windows 7 to Windows 10. Importantly, unlike wipe and load methods, all of this can be achieved without having to move your data off the disk. To learn more please also check out: http://aka.ms/mbr2gpt
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