Challenge
When attempting to restore a Windows machine using Bare Metal Recovery, the restore displays the warning:
OS disk in backup uses MBR disk. This may cause boot issues on UEFI systems
Cause
The Bare Metal Recovery restore has detected that the system within the selected restore point was using MBR at the time of backup, and the system that the restore is being run on has been booted with UEFI BIOS.
Solution
Change BIOS settings from UEFI to Legacy Mode
If your machine supports the legacy BIOS mode, use the legacy BIOS mode instead of the UEFI mode.
If your machine does not support the legacy BIOS mode, the steps below will provide instructions on restoring the MBR-based backup to a UEFI system.
More Information
To learn about restoring a GPT disk to the incompatible legacy BIOS system, see Veeam KB2407.
