Topic List

Click a topic to learn more.


Term of the Moment

Amazon Web Services


Look Up Another Term


Definition: GUID partition table


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 18 exabytes compared to 2.2TB for the MBR. GPT supports a "protective" MBR so that third-party MBR utilities can identify the disk correctly, as well as a "legacy" MBR if the first partition must boot as an MBR drive. See UEFI and MBR disk.