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The GUID Partition Table is a standard for the layout of partition tables of a physical computer storage device, such as a hard disk drive or solid-state drive, using universally unique identifiers, which are also known as globally unique identifiers. Forming a part of the Unified Extensible Firmware Interface standard , it is nevertheless also used for some BIOS systems, because of the limitations of master boot record partition tables, which use 32 bits for logical block addressing of traditional 512-byte disk sectors.
All modern personal computer operating systems support GPT. Some, including macOS and Microsoft Windows on the x86 architecture, support booting from GPT partitions only on systems with EFI firmware, but FreeBSD and most Linux distributions can boot from GPT partitions on systems with either the BIOS or the EFI firmware interface.