Uploaded June 2026 | Updated September 2026, 3 weeks ago

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Need to convert your Windows system disk from **MBR to GPT** without reinstalling Windows?

In this step-by-step tutorial, I'll show you how to safely convert an existing Windows 10 or Windows 11 installation from MBR to GPT using the official **MBR2GPT** command-line tool.

This video also explains how to fix the common **MBR2GPT validation failed** error caused by having more than three partitions on the system disk.

✅ In this video:
• Check if your disk is MBR
• Verify the number of partitions
• Find your disk number using DiskPart
• Fix "MBR2GPT validation failed" error
• Delete the extra partition safely (after backup)
• Convert MBR to GPT using Command Prompt
• Change BIOS from Legacy to UEFI
• Boot Windows in UEFI mode
• Recreate the deleted partition
• Remove unwanted drive letters from the EFI partition

Commands used in this video:

mbr2gpt /disk:0 /validate /allowFullOS

mbr2gpt /disk:0 /convert /allowFullOS

⚠️ Important:
Always back up important files before deleting any partition. If your system disk has more than three partitions, you'll need to remove the extra partition before converting.

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