Works on Windows 10 / 11 / Server

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🔥 Before You Start

Converting GPT → MBR in CMD requires erasing the disk.
There is no lossless CMD method.

✔ Backup your data
✔ Make sure you’re selecting the correct disk
✔ Unplug external drives you don’t want to touch

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🧰 Requirements

• Administrator access
• Windows installation or Windows Terminal / CMD
• Target disk must not be your running system disk (unless booted from USB)

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📘 Step-by-Step Guide

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STEP 1 — Open CMD as Administrator

1. Press Windows Key
2. Type: cmd
3. Right-click Command Prompt
4. Choose Run as administrator

You should see:

C:\Windows\System32>

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STEP 2 — Launch DiskPart

Type:

diskpart

DiskPart opens and shows:

DISKPART>

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STEP 3 — List Available Disks

Type:

list disk

You will see something like:

Disk	Size	GPT
Disk 0	512 GB	*
Disk 1	120 GB	*

The GPT column shows which disks use GPT.

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STEP 4 — Select the Target Disk

Replace 1 with your actual disk number:

select disk 1

DiskPart will respond:

Disk 1 is now the selected disk.

🚨 Make sure this is the correct disk. Next steps delete everything.

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STEP 5 — Clean the Disk (Erases All Partitions)

clean

You should see:

DiskPart succeeded in cleaning the disk.

This step wipes the partition table.

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STEP 6 — Convert GPT to MBR

convert mbr

Output:

DiskPart successfully converted the selected disk to MBR format.

🎉 The conversion is now complete!

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Optional Steps (Create a Partition)

If you want to immediately create a new MBR partition:

Create a primary partition

create partition primary

Format it (fast format)

format fs=ntfs quick

Assign a drive letter

assign letter=E

DiskPart will confirm each step.

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✔️ Tutorial Summary

Step	Command
Start DiskPart	diskpart
Show disks	list disk
Select disk	select disk X
Clean disk	clean
Convert GPT → MBR	convert mbr