Restoring GPT Disk to Incompatible Legacy BIOS System

Challenge

After selecting a restore point during the bare metal restore configuration, the following message pops up:
 

OS disk in backup uses GPT disk.  This may cause boot issues on BIOS systems.

If this is ignored and the restore process completes, the following may happen when the restored machine boots up:
 

No boot disk found

or

An operating system wasn’t found

Cause

Due to compatibility issues between GPT formatted partitions and legacy BIOS systems, certain systems that can only run in legacy BIOS are unable to recognize the formatted boot partitions. This prevents the system from successfully booting to the underlining operating system.

Solution

To resolve the compatibility issues, it is necessary to format the System partition correctly as outlined in the following steps.

1. Boot the Recovery Media.
2. Go to Tools and start command prompt utility.
3. Run the following commands one by one:
 

diskpart

list disk    

select disk 0

clean

convert mbr

create partition primary size=100

select part 1

format fs=ntfs label=”System reserved” quick

active

assign letter=S

exit

Close the command prompt.

4. Start the restore. While allocating the volumes do not delete the system reserved partition.
5. Do not reboot once restore is completed.
6. Go back to Tools > Command Prompt utility.
7. Run the following commands one by one.
 

diskpart

list vol

exit

8. Once you exit the diskpart context, run the following command in the command prompt: 
 

bcdboot C:\Windows /S S: //volume letter I got from previous list volume in disk part

9. Reboot and start the restored OS.

More Information

If the system does allow for both MBR and GPT partitions, check with your vendor whether this can be changed in the BIOS settings of the system.