how many primary partitions are supported on a gpt partitioned disk?
A GPT disk offers these benefits: 1  Allows up to 128 primary partitions. 2  Master Boot Record (MBR) disks can support up to four primary partitions and an additional 124 partitions inside extended partitions. 3  Allows a much larger partition size--greater than 2 terabytes (TB), which is the limit for MBR disks.