When booting, the Veeam Agent machine fails to detect the operating system. You may see the following error message:
OS disk in backup uses MBR disk. This may cause boot issues on UEFI systems
Due to compatibility issues between certain BIOS versions and disk formats, Windows may not boot as the OS fails to detect the necessary boot files.
If your machine supports the legacy BIOS mode, use the legacy BIOS mode instead of the UEFI mode. If you machine does not support the legacy BIOS mode, do the following:
- Boot from the Veeam Recovery Media.
- Go to Tools and start the Command Prompt utility.
- Run the following commands one by one:
C:\Users\administrator\diskpart DISKPART> list diskAt this step, find the disk that you are going to use as a restore destination for the primary operating system. In this example, we assume that disk 0 is a restore destination for the primary operating system.
DISKPART> select disk 0Mind that the following command will remove all data from the disk 0.
DISKPART> clean DISKPART> convert gpt DISKPART> create partition efi size=200 DISKPART> select partition 1 DISKPART> format quick fs=fat32 label="System" DISKPART> assign letter=G DISKPART> create partition msr size=128 DISKPART> exit
- Start the restore process in the Manual restore mode. Do not restore the system partition and do not delete the partitions created at the previous step. Mind that you will see the "OS disk in backup uses MBR disk" warning during the restore process.
- After the restore process completes, do not reboot the Veeam Agent machine.
- Go to Tools > Command Prompt utility and run the following commands:
C:\Users\administrator\mkdir G:\EFI\Microsoft\Boot C:\Users\administrator\xcopy /s C:\Windows\Boot\EFI\*.* G:\EFI\Microsoft\Boot C:\Users\administrator\G: C:\Users\administrator\cd G:\EFI\Microsoft\Boot C:\Users\administrator\bootrec /rebuildbcd
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