Master boot record

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A master boot record (MBR), or partition sector, is the 512-byte boot sector that is the first sector ("LBA/absolute sector 0") of a partitioned data storage device such as a hard disk. (The boot sector of a non-partitioned device is a volume boot record. These are usually different, although it is possible to create a record that acts as both; it is called a multiboot record.)

The MBR may be used for one or more of the following:

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.[citation needed]

Contents

Disk partitioning

^ a Formally, status values other than 0x00 and 0x80 are undefined.

^ b Starting Sector fields are limited to 1024 cylinders, 255 heads, and 63 sectors;[citation needed] Ending Sector fields have the same limitations.

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