Converting a disk from MBR to GPT

Converting a disk from MBR to GPT is essential for UEFI booting and Windows 11 compatibility. The safest, non-destructive method is using the built-in mbr2gpt.exe command in Windows 10/11. For non-boot drives, Disk Management can be used, but this requires deleting all volumes first. Always back up data before attempting. 

Method: Using mbr2gpt.exe (No Data Loss, Recommended for OS Drive) 

1. Open Command Prompt as Administrator.
2. Validate the disk: mbr2gpt /validate /allowFullOS.
3. Convert the disk: mbr2gpt /convert /allowFullOS.
4. After success, enter your PC’s BIOS/UEFI firmware and change the boot mode to UEFI