What is partition table?

A partition table is a 64-byte data structure that provides basic information for a computer's operating system about the division of the hard disk drive into primary partitions. It is part of the master boot record (MBR), which is a small program that is executed when a computer boots (i.e., starts up) in order to find the operating system and load it into memory.

See: Disk Partition, MBR, Partition Boot Sector