Forming a part of the Unified Extensible Firmware Interface (UEFI) standard ( Unified EFI Forum-proposed replacement for the PC BIOS), it is nevertheless also used for some BIOSs, because of the limitations of master boot record (MBR) partition tables, which use 32 bits for logical block addressing (LBA) of traditional 512-byte disk sectors.Īll modern personal computer operating systems support GPT. The GUID Partition Table ( GPT) 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 (GUIDs). Negative LBA addresses indicate a position from the end of the volume, with −1 being the last addressable block.
The corresponding partition entries are assumed to be located in LBA 2–33. In this example, each logical block is 512 bytes in size and each entry has 128 bytes. The layout of a disk with the GUID Partition Table.
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