Trying to convert my disk to uefi using mbr2gpt

[zenith sun]

Besides that I am not sure if validate and allowFullOS should be together.

[hallow crag]

Doing an mbr to gpt swap sounds dangerous. In concept if you know where your partitions start you could mark the dust as unformated and then re layout the partition markers exactly the same. If you don't do it exactly right you WILL lose all data on the drive. That would convert the mbr to gpt, but next you will have to create an EFI partition likely and get windows to accept it. That part should be as easy as running a windows fix system tool on a USB drive (booted to the drive). This is just a partial solution. I don't know windows to know how to do that. You could just try to plug a windows 11 iso in and see if it can figure out how to keep your data and upgrade. I have done that before with windows 10.

[tired shoal]

Convert drive from MBR partition format to (Win 11 compatible) GPT without formatting

—————
Disclaimer:
Back up your drive. This is an inherently risky process that worked for me. It may not work for you and you risk permanent loss of all your data. I made an image of my drive in case anything went wrong. You should too.
You do this at your own risk.

Gather Info

Create a Win 10 boot media USB drive

Boot from the USB drive
At the first screen where you can click, press “shift+F10”

Type:

DiskPart List disk

Note the drive number (0,1,2,etc) of the one you want to convert.

Exit

We will use drive 0 as an example:
MBR2GPT /drive:0 /Validate

Commit Drive to GPT

MBR2GPT /drive:0 /Convert

Reboot

Verify

https://github.com/rcmaehl/WhyNotWin11

[hallow crag]

Did you try this? Windows could be blocking you from editing data on the drive you are actively using.

[tired shoal]

It’s why you boot from the windows 10 boot media.