Windows 10: Need help converting partition from MBR to GPT to upgrade to Windows 11.

Hi, I need to upgrade to Windows 11, but have run into the issue of all of my drives being partitioned as MBR. When trying to run MBR2GPT to convert the drives, the validation fails. I believe this is because I fumbled the upgrade from Windows 7 to Windows 10 and now have two "System Reserved" partitions, one on Drive 0 and one on Drive 3. My BOOT drive is on Drive 3 currently. I will attach a screenshot for context. Can I get a step-by-step guide on how to clean this up and properly convert the drives to GPT? Thank you very much.-Trevor

:)

 

Convert only one partition on the disk from MBR to GPT

Follow the steps listed here on using GPTgen. He also lists how to create and restore backups.

Converting MBR to GPT without deleting your partitions

 

clone MBR HD to bootable GPT partition?

Hi,

1. You cannot convert mbr to gpt without data loss. otherwise, you can follow directions here:

FROM WINDOWS RECOVERY CONSOLE:

To change a master boot record disk into a GUID partition table disk using a command line

• 
  Back up or move the data on the basic master boot record (MBR) disk you want to convert into a GUID partition table (GPT) disk.
  
• 
  Open an elevated command prompt (right-click Command Prompt, and then click Run as Administrator) and type diskpart. If the disk does not contain any partitions or volumes, skip to step 6.
  
• 
  At the DISKPART prompt, type list disk. Make note of the disk number you want to convert.
  
• 
  At the DISKPART prompt, type select disk <disknumber>.
  
• 
  At the DISKPART prompt, type clean.
  

2. I'd suggest converting your vista drive to a virtual machine, load that up on your windows 10 system and use a program like virtualbox to run it.

 

Convert only one partition on the disk from MBR to GPT

Hi,

Yes

Without deleting all partitions you can achieve this. Just use a disk converter named an AOMEI Partition Assistant Professional Edition.

Convert MBR Partition Table to GPT without Data Loss

Step 3:
in this document

AOMEI Partition Assistant Lite Edition.
It’s a free multifunction partition management software. This tool’s feature can help you convert a disk with data into GPT or MBR style without data loss.