Windows 10: Change MBR partition to GPT, OS and MBR on separate disks

I'm trying to convert my MBR partition (which is on an HDD) to a GPT-based boot record, but my OS install is on an SSD (i.e. a different drive than the MBR). I'm not exactly sure how this happened when I was installing Windows; I think the HDD was set as disk 0 while the SSD was set as disk 1. However, what's done is done, so here I am trying to fix it.

When I run mbr2gpt /validate, I get an error saying Cannot find OS partition(s) for disk 0. This makes sense, as there is no OS partition on Disk 0. Running mbr2gpt /disk:1 /validate tells me that the disk layout validation failed... which makes sense because the MBR isn't on that disk to begin with.

Is there a way to convert the mbr to gpt without needing the OS on the same disk as the boot partition?

Please forgive me if I'm missing something that I should be including here; this is my first post in this subreddit, but I did read over the rules and think I'm covered.

submitted by /u/apnorton
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:)

 

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

Step 2
Convert MBR to GPT without data loss

 

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.

The Simplest Way to Convert MBR Partition Table to GPT

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.