GUID Partition Table (GPT)

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GUID Partition Table (GPT) is a standard for the layout of the partition table on a physical storage device, such as a hard disk drive or solid-state drive, using the globally Unique identifiers (GUID). Although it forms a part of the Unified extensible Firmware Interface (UEFI) Standard (Unified EFI Forum proposed REPLACEM ENT for the PC BIOS), it's also used on some BIOS systems because of the limitations of Master boot record (MBR) partitio n tables, which use + bits for storing logical block addresses (LBA) and size information on a traditionally byte dis K sector.

The globally unique identity partition Table (GUID Partitiontable, abbreviation:GPT) is the standard for the structural layout of the partitioned table of an entity hard disk. It is part of the Extensible Firmware Interface (EFI) standard (BIOS used by Intel to replace a personal computer) and is used to replace a master boot record (MBR) partition table that stores logical block addresses and size information in a 32bits BIOS system. For disks with a 512-byte sector, the MBR partition table does not support partitions larger than 2.2TB (2.2x1012 bytes)^{[1], however, some hard disk manufacturers (such as Seagate and Western data) Note this limitation and upgrade their larger capacity disks to 4KB sectors. This means that the maximum effective capacity of the MBR is increased to + TiB.}

GUID Partition Table (GPT)