The MBR disk is working with legacy BIOS mode, while the GPT disk is working with UEFI. Thus, you need to make sure if your device supports UEFI before converting the disk to GPT.Īfter the disk has been converted to GPT partition style, the firmware must be reconfigured to boot in UEFI mode. And the news from Microsoft shows that Windows 11 only supports UEFI mode to boot.Ģ. You need to make sure that the current partition layout is displayed prior to conversion - a system reserved partition, a windows partition, and a recovery partition.ģ. For Windows to remain bootable after the MBR to GPT conversion, an EFI system partition (ESP) must be in place. If the existing MBR system partition is not reused for the ESP, it is no longer used by the boot process after the conversion. You can see the result like the following screenshot: Type C:\Windows\system32>mbr2gpt /convert /disk:0 /allowfullos Then, you can type the syntax in the command prompt to convert MBR to GPT disk with MBR2GPT tool.
*The MBR2GPT tool can convert operating disk that have earlier versions of Windows 10 installed, such as version 1570, 1511, and 1607.