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.

Learn how to convert MBR to GPT disk without data loss in Windows 11/10, using Diskpart, Gptgen, or AOMEI Partition Assistant. MBR disks support only 4 partition tables.

If you are not able to convert MBR to GPT, and get MBR2GPT failed - Causing backup/restore privilege Issues error, then see this post.

Disk /dev/sda: 2500GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 17.4kB 128MB 128MB ext3 2 128MB 2500GB 2500GB xfs ...