GPT (GUID Partition Table)

The GUID Partition Table, known as the GPT, is a popular disk partitioning scheme used across most operating systems, including Windows and Unix-class operating systems such as Mac OS X. It was introduced by Intel in the late 1990's and has since become the standard layout of the partition table on a physical hard disk. It is a successor to many partition tables, such as MBR and APM, overcoming their limitations of using 32 bits for logical block addresses and a standard block size of 512 bytes.

See MBR.