Question Converting MBR to GPT problem ?

[garrusvakarian]

Im going to update from Win 10 to Win 11, but have a problem.
My OS drive (M.2 SSD) is Disk 4 on the list instead of Disk 0 and the OS disk is in MBR, I have followed this guide:
https://www.windowscentral.com/how-convert-mbr-disk-gpt-move-bios-uefi-windows-10

But it doesn't work, I also went in Safe Mode Prompt and tried with write "mbr2gpt /convert /disk:4", but only got a invalid message.

I don't know how what I should do in order to convert the OS disk from MBR to GPT wituout data loss.

Anyone here who have any tips?

 

[SkyNetRising]

Anyone here who have any tips?

Please show screenshot from Disk Management.
Also provide screenshot of the error message.
(upload to imgur.com and post link)

Also list specs of your system. It has to support UEFI boot or after conversion your pc becomes unbootable.
Are you sure it has required specs for windows 11 support?

There are specific requirements for mbr2gpt to work.
https://learn.microsoft.com/en-us/windows/deployment/mbr-to-gpt

 

[garrusvakarian]

Please show screenshot from Disk Management.
Also provide screenshot of the error message.
(upload to imgur.com and post link)

Also list specs of your system. It has to support UEFI boot or after conversion your pc becomes unbootable.
Are you sure it has required specs for windows 11 support?

There are specific requirements for mbr2gpt to work.
https://learn.microsoft.com/en-us/windows/deployment/mbr-to-gpt

The system should support it:
ASUS PRIME Z370-A
Intel Core i7 8700K

 

[SkyNetRising]

The system should support it:
ASUS PRIME Z370-A
Intel Core i7 8700K

You have bootloader on drive F: and windows on drive C: .
They are on different physical disks. Mbr2gpt doesn't support this configuration.
You have to create bootloader on same disk, where windows is installed.

Execute following from elevated command prompt.
If you get any errors, then stop immediately and show screenshot.

diskpart​

list disk​

select disk 4​

(select 232GB disk)​

list partition​

select partition 2​

(select 516MB partition)​

delete partition override​

create partition primary​

format fs=ntfs quick​

active​

assign letter=J​

exit​

bcdboot C:\windows /s J:​

Last message should be "Boot files created successfully".
Boot into BIOS and change Boot priority settings.
Set 250GB drive as first in boot priority.

After that you can proceed with mbr2gpt conversion.
Execute from elevated command prompt. Validate first. If that is successful, then proceed to convert.

mbr2gpt /validate /disk:4 /allowfullos​

mbr2gpt /convert /disk:4 /allowfullos​

 

[garrusvakarian]

You have bootloader on drive F: and windows on drive C: .
They are on different physical disks. Mbr2gpt doesn't support this configuration.
You have to create bootloader on same disk, where windows is installed.

Execute following from elevated command prompt.
If you get any errors, then stop immediately and show screenshot.

diskpart​

list disk​

select disk 4​

(select 232GB disk)​

list partition​

select partition 2​

(select 516MB partition)​

delete partition override​

create partition primary​

format fs=ntfs quick​

active​

assign letter=J​

exit​

bcdboot C:\windows /s J:​

Last message should be "Boot files created successfully".
Boot into BIOS and change Boot priority settings.
Set 250GB drive as first in boot priority.

After that you can proceed with mbr2gpt conversion.
Execute from elevated command prompt. Validate first. If that is successful, then proceed to convert.

mbr2gpt /validate /disk:4 /allowfullos​

mbr2gpt /convert /disk:4 /allowfullos​

That worked, thanks alot!

But the strange thing is that the PC Health Check App for Windows says that my computer meets all criteria for Windows 11, but not in Windows Update... So I'm stuck.

 

[SkyNetRising]

But the strange thing is that the PC Health Check App for Windows says that my computer meets all criteria for Windows 11, but not in Windows Update... So I'm stuck.

Windows 11 requires TPM 2.0 to be enabled.
On Intel boards in BIOS it's called Intel Platform Trust technology.
Go into BIOS and enable it.

Did you manage to boot into UEFI mode?
You can check current boot mode with msinfo32.