"Advantages of the GPT scheme
UEFI uses the
GUID Partition Table, which utilizes
Globally
Unique
IDs to address partitions, and allows booting from hard disks as large as 9.4ZB [one zettabyte = one billion terabytes], while in MBR bootable disks are limited in size to 2.2TB.
Up to 128 partitions [“primary” partitions or GPT partitions] for the Windows implementation [only 4 in MBR].
The maximum allowed partition size is 18 exabytes [only 2 terabytes in MBR].
More reliable thanks to replication and cyclic redundancy check [CRC] protection of the partition table.
Data critical to the platform operation is located in partitions, but not in un-partitioned or hidden sectors as this is the case with MBR.
A well-defined and fully self-identifying partition format. Support for additional partition type
GUIDs defined by original equipment manufacturers [OEMs], independent software vendors [ISVs], and other operating systems."