Acronym for GUID partition table
Computers with an Intel Itanium
processor use the Extensible Firmware Interface (EFI)
between firmware, hardware,
and OS. EFI has a new type of disk
partitioning system, called the GUID (globally unique identifier) partition
table (GPT). Unlike Master Boot Record (MBR)
partitioned disks, data
critical to platform operation is located in
partitions instead of unpartitioned or hidden sectors.
GPT partitioned disks have redundant primary and
backup partition tables for improved partition data structure integrity.