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