Windows 10: Convert drive partition back to MBR after GPT conversion

I recently had to replace a hard drive on my old Dell XPS 8100 that was running Win 10. A few years ago I replaced the OS C: drive with a 3tb Western Digital but the system would only recognize 2tb because of the MBR partition. I figured now would be a good time to also look at that issue and I'm wishing I had just left it alone. I did the conversion to GPT just to find out that the old bios in the pc is legacy only no UEFI support so it can't boot the drive anymore - I know . . . stupid!! I put an old drive in it that has Win7 on it and I can see drive 0. All my data is there and I c

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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 mbr partition to gpt

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During installing windows" select window has MBR partition windows can only install in gpt disk" this error come . Then i formate all the disk partition. Still this error will occur. Then i start converting mbr to gpt . But my
other drives are not seen . only System reserved and usb drive is seen . Other four drives are not seen