
A master boot record (MBR) is a special type of boot sector at the very beginning of partitioned computer mass storage devices like fixed disks or removable drives intended for use with IBM PC-compatible systems and beyond. The concept of MBRs was publicly introduced in 1983 with PC DOS 2.0. The MBR holds the information on how the logical partiti...
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http://en.wikipedia.org/wiki/Master_boot_record

The first sector on a disk, containing the partition table and master boot loader. Abbreviated MBR.
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http://www.encyclo.co.uk/local/20581
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