MBRtool is a free utility designed to backup, restore, and manipulate your hard disk MBR.
The MBR could easily be seen as one of the most important sectors on the disk. If anything happens to the contents of this sector, the data on your disk could be unreachable. Or the computer might simply not start anymore.
MBRtool is not an automatic recovery program but will allow users to prevent data loss (caused by MBR corruption) by backing up the MBR. It offers power users all the power they'll ever need to 'mess' with their MBR.