Prerequisites
Ensure full system backup before starting. Verify disk integrity with chkdsk /f. Confirm UEFI firmware availability. Disable BIOS legacy boot. Keep AC power connected.
Convert System Disk via MBR2GPT
For Windows 10/11 system disks:
- Launch Command Prompt as Administrator
- Validate disk compatibility: mbr2gpt /validate /disk:[number]
- Execute conversion: mbr2gpt /convert /disk:[number] /allowFullOS
Non-System Disk Conversion
Use diskpart for data disks:
- Run diskpart
- list disk → select disk [number]
- Delete protected partitions: clean
- convert gpt → Create new partitions manually
Post-Conversion Steps
- Enable UEFI boot in BIOS settings
- Verify boot mode via msinfo32 (BIOS Mode should show UEFI)
- Confirm partition style in Disk Management
Critical Notes
MBR2GPT requires contiguous recovery partition. Back up before diskpart usage - /clean command erases all data. Dynamic disks aren't supported. Test system stability before deleting backups.
