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 ...

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.

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 ...

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.

Although my Mac Pro could use this drive for external storage, when I attempted to install Leopard on it, I was told that, as it was connected to an Intel Mac, I must use the GUID partition scheme.

Content (IOContent): GUID_partition_scheme OS Can Be Installed: No Media Type: Generic Protocol: SATA SMART Status: Verified Total Size: 121.3 GB (121332826112 Bytes) (exactly 236978176 512-Byte ...

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.