Windows 10: I convert my MBR disk into MBR with MBR2GPT. Windows became UEFI and GPT, so what settings...

Let me warn you, why do I make my MBR disk GPT and make Legacy UEFI? I do all this basically to install Windows 11, because I have a W10 Pro and I want to install W11 with free upgrade. My computer supports TPM 2.0, Secure Boot. However I installed W10 with Legacy+MBR combination. I know that MBR2GPT converts without data loss. That's why I converted it right away. But I guess there are settings in the BIOS as well. What settings should I do in the BIOS, for it to be UEFI? I'm using ASUS. I wrote to ASUS official support months ago , I wrote again. They didn't answer. I called, they didn't k

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convert MBR to GPT disk

convert mbr to gpt

There is a way to convert mbr to gpt without data loss. clean command deletes all datas inside the disk, so dont use this command

boot with windows dvd , and get into command prompt

type diskpart , find the disk number , which is need to convert mbr to gpt

say disk number is 0

exit diskpart

type below command in command prompt

mbr2gpt /convert /disk:0

wait for some minutes to complete , once you get commpleted successfuly means, exit and close ,

shutdown the pc , remove windows dvd

important

After the disk has been converted to GPT partition style, the firmware must be reconfigured to boot in UEFI mode.


Make sure that your device supports UEFI before attempting to convert the disk.

 

How to convert an MBR disk into a GPT disk

Hi,

Thanks for the reply.

This is an unexpected behavior, after you convert the disk from MBR to GPT, it shouldn’t convert back automatically, however you can try to convert the disk back to GPT format if you are on Windows 10 version 1703 or later using the inbuilt utility
MBR2GPT.EXE.

• Click on Start menu (Windows logo), type
  CMD.
  
• Right click on Command prompt and select
  Run as administrator.
  
• Type MBR2GPT /validate /AllowFullOS
  
• Once the validation is successful, execute the following command and check the results.
  
• Type MBR2GPT /Convert /AllowFullOS
  
• Once the conversion is successful, you must boot the computer into BIOS and change the BIOS mode to
  UEFI.
  

Disclaimer: Modifying BIOS/ complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly.
Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.

For more information about MBR2GPT utility, please refer to the article:
Convert MBR disk into GPT using MBR2GPT.EXE

Hope it helps.

Thanks,

Peer Samie

Microsoft Community-Moderator

 

Convert only one partition on the disk from MBR to GPT

Step 2
Convert MBR to GPT without data loss