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UriahZane's avatar
UriahZane
Iron Contributor
Mar 25, 2025

How to convert mbr to gpt without operating system

I've got a problem I'm trying to solve! I'm having a problem and would like to ask for your help. I have a computer with no operating system installed and a hard drive that is partitioned in MBR for...
BodenAce's avatar
BodenAce
Iron Contributor
Mar 25, 2025

Another option is using Windows PE to convert MBR to GPT without OS. Windows PE and Diskpart are both tools that play an important role in computer system maintenance, installation and disk management.

1. Create a WinPE boot disk:
On another Windows computer, download the Windows ADK (Evaluation and Deployment Kit). Use the MakeWinPEMedia command to make a WinPE USB flash drive.

2. Boot from WinPE USB flash drive:
Insert the USB flash drive and enter BIOS/UEFI to set the USB flash drive as the first boot item. After booting into WinPE environment, press Shift + F10 to enter command prompt.

3. Use Diskpart to convert MBR to GPT without operating system:

diskpart
list disk
select disk 0
clean
convert gpt
exit


When MBR to GPT conversion is complete, exit and start installing Windows 11 on GPT disk.

Pros:
1. Does not require a Windows installation disk, can directly convert the disk format.
2. For situations where you cannot directly access the Windows installation interface.

Cons:
1. Need to create WinPE boot disk, more complicated.
2. Disk data will be emptied.

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