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.

Format disks / images Fix a partition table, recover a deleted partition Recover the GUID Partition Table from its backup Locate partitions which are inaccessible / ignored by the OS Verify the ...

However, there's an asymmetry here. Although a PPC machine cannot boot up from a GUID-partitioned disk, an Intel machine can boot up from an Apple partition scheme disk.

Check the Partition style under disk information in the Volume tab. It will show either GUID Partition Table (GPT) or Master Boot Record (MBR). Once everything is verified, you can start the ...

(Ignore any partitions labeled GUID_partition_scheme or EFI.) Now you need to find out what size your new partition can be. Run this command: diskutil resizeVolume disk_identifier limits ...