The fixmbr command is a Recovery Console command that writes a new master boot record to the hard drive you specify.
A+ Computer Repair Training – FIXMBR – Windows XP Recovery Console Command Tutorial
The command has the following form:
The device_name parameter specifies the disk location to which a master boot record is written. If no device is specified, the master boot record writes to the primary boot drive.
Here are two examples of the fixmbr command to illustrate its usage:
