How to convert mbr to gpt without operating system

MBR2GPT is a tool provided by Microsoft for non-destructive conversion of MBR (Master Boot Record) disks to GPT (GUID Partition Table) disks on computers based on the UEFI Unified Extensible Firmware Interface.

How to convert MBR to GPT without operating system

1. Create a Windows PE boot disk:
On another Windows computer, download and install the Windows ADK and WinPE add-ons. Use the MakeWinPEMedia command to create a WinPE USB flash drive. Insert the USB flash drive and set the BIOS to boot from the USB flash drive.

2. Check if the disk meets the conversion conditions:
In the WinPE environment, press Shift + F10 to open the command prompt.

3. Run the following command to check whether the disk meets the conversion requirements:

mbr2gpt /validate /disk:0

If validation completed successfully is returned, the disk can be converted.

4. Run the following command to start the conversion:

mbr2gpt /convert /disk:0 /allowfullOS

Wait for the conversion to complete, which usually takes a few seconds. Seeing Conversion completed successfully indicates that the conversion was successful.

5. Enable UEFI mode:
Go to BIOS/UEFI setup. Change the Boot Mode from Legacy to UEFI, and make sure Secure Boot is turned off (some motherboards have this feature). Make sure Secure Boot is turned off (some motherboards may require it). Save the changes and reboot the computer.

This is a completely guide to show you how to convert mbr to gpt without os. Please back up the data first.