Restoring GPT Disk to Incompatible Legacy BIOS System

KB ID: 2407
Product: Veeam Agent for Microsoft Windows
Version: 2.0
Published:
Last Modified: 2017-12-06

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.

User-added image

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    
At this step, find the disk you are going to use as a restore destination. In this example, we'll use disk 0.     
select disk 0
NOTE: The 'clean' command erases the selected disk completely.
clean
convert mbr
create partition primary size=100
select part 1
format fs=ntfs label=”System reserved” quick
active
assign letter=S

The '​exit' command will take you out of the diskpart utility.
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

find the volume with restored operating system. In this example it’s going to be volume C
list vol

exit from disk part utility
exit

8. Once you exit the diskpart context, run the following command in the command prompt (in the example below, S: would be the volume letter assigned during step 3 above): 
 
bcdboot C:\Windows /s S: /f ALL
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.
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