But as of Mac OS X 10.4.6, Terminal also lets you ... (Ignore any partitions labeled GUID_partition_scheme or EFI.) Although you can resize the first partition, you can’t change its format ...

If you installed Lion or Mountain Lion on a supported hard-drive configuration (your Mac must have an internal drive formatted with a GUID partition scheme), chances are good that it’s there.

Currently, Disk Utility supports GUID, Apple Partition Map (APM), and ... but still supported partition map scheme. APM was used on early versions of Mac OS which ran on PowerPC-based Macs ...

Click the Options button to make sure the GUID partition scheme is used, and then click Apply to repartition the drive. When the partitions are recreated, restore the Mac OS from the Time Machine ...

Likewise, an APFS drive will be readable by a Mac ... Scheme option, Apple recommends using Master Boot Record to ensure the drive is compatible with all Windows PCs. You could also use GUID ...

choose "Mac OS Extended (Journaled)." If shown, choose the scheme. In almost all cases, you should choose GUID Partition Map. 8. Click "Erase." 9. It will take a few moments for the disk to erase.

1] Note the name of the USB drive, which is connected to the mac. It should be available ... SIZE IDENTIFIER 0: GUID_partition_scheme *16.2 GB disk4 EFI EFI 1 ...

you can then re-establish a multiple partition scheme using Disk Utility and install Mac OS X on the appropriate volume.