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.

Tagging along with EFI is a new partition scheme: GUID Partition Table (GPT); GUID itself is an acronym, expanding to Globally Unique Identifier. GUIDs are locally generated, world-unique random ...

Sometimes installing OS X may result in odd behavior if the partition scheme on the drive is not set up properly. If you are experiencing problems, a simple repartition during setup may be an easy ...

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.

(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 ...

Select any partition that you plan to use as a startup disk for the Mac OS and click on the "Options" button to set its partition as GUID.

I want to partition the card so I can use it for an OS install disk (Mac OS Extended GUID) in one partition and as a camera disk (MS-DOS FAT) in the other partition.

Depending on the partition scheme, these are the file systems Mac OS 10.4 supports: Mac OS Extended or HFS+ is an improved version of Apple's Hierarchical File System from the mid-1980s.