How to Convert Windows 10 from Legacy BIOS to UEFI without Data Loss – Windows Blog by Brink

How to Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

Starting in Windows 10 version 1703 build 15063, you can use the MBR2GPT.EXE command line tool to convert a disk from Master Boot Record (MBR) (used in Legacy BIOS) to GUID Partition Table (GPT) (used in UEFI) without having to clean install Windows 10 or modifying or deleting data on the disk. The tool is designed to be run from a Windows Preinstallation Environment (Windows PE) command prompt, but can also be run from the full Windows 10 operating system (OS).

If your PC or motherboard supports UEFI, then you could use the MBR2GPT tool to switch from a Legacy BIOS to UEFI Windows 10 installation without data loss.

This tutorial will show you how to convert a Legacy BIOS Windows 10 installation using a MBR disk to a UEFI Windows 10 installation using a GPT disk without data loss.

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