A Master Boot Record (MBR), or partition sector, is the 512-byte boot sector that is the first sector ("Sector 0") of a partitioned data storage device such as a hard disk.Due to the broad popularity of IBM PC-compatible computers, this type of MBR is widely used, to the extent of being supported by, and incorporated into, other computer types, including newer cross-platform standards for bootstrapping and partitioning.Table of primary partitions(Four 16-byte entries, IBM Partition Tab
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http://blog.csdn.net/sooqing/archive/2007/07/06/1680950.aspx