or GPT, uses GUID and is a standard for the layout of the partition table on a physical hard disk. An MBR formatted disk can have only four primary partitions and can manage data only up to 2TB.

The format used to define the hard disk partitions in computers with UEFI startup firmware. The GUID Partition Table (GPT) replaces the previous master boot record (MBR). GPT partitions can hold ...

Gptgen is a tool designed to non-destructively convert hard disks partitioned in the common, “MSDOS-style” MBR scheme (including extended partitions) to use a GUID partition table (GPT).