MBR2GPT cannot find os partition

Question

Win 10 home current build

I'm trying to move to win 11 from 10

When i try to perform MBR2GPT /validate it says cannot find OS partition

Answer 1

Run the following command as an administrator:

bcdboot C:\Windows /s C:

and reboot. Post another image of disk management.

You want to move your startup files to Disk 0, thus abandoning System-reserviert on that other disk.

Answer 2

Hi Lys,
I am Sumit here to assist you with this question.

Can you share the MBR2GPT log from C:/Windows?

https://answers.microsoft.com/en-us/windows/for...

Keep us posted.

Answer 3

Thank you brother, in germany we say mein löwe, mein bär, mein held

Answer 4

USING REAGENC + BCDBOOT >> MBR2GPT :: Success!

1) REAgentC : REAgentC command-line options | Microsoft Learn

> reagentc /info

> reagentc /enable

2) BCDBOOT : BCDBoot Command-Line Options | Microsoft Learn

Copying my working EFI boot data to a place where mbr2gpt could find it:

> bcdboot c:\Windows /f bios /s c:  

Note: My system was already booting in UEFI mode to a MBR disk,

which is why there was no BCD data in the typical location.

This should fix that issue and allow mbr2gpt to do it's thing.

And follow instructions on: MBR2GPT - Windows Deployment | Microsoft Learn