Microsoft DOS fixmbr command
The fixmbr command is a recovery console command that creates a new boot record.
The fixmbr command is a recovery console command that is available in the below Microsoft operating systems.
Repairs the master boot record of the boot disk. The fixmbr command is only available when you are using the Recovery Console.
|device_name||The device (drive) you want to write a new master boot record. The name can be obtained from the output of the map command.|
In the above example, the boot record would be re-written for the first disk drive.