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 ...

Apple moved from its long standing Apple Partition Map (APM) to the Intel-created GUID Partition table (GPT) which is part of the EFI specification. This article will examine these changes to the ...

0: GUID_partition_scheme *121.3 GB disk0 1: EFI 209.7 MB disk0s1 2: Apple_CoreStorage 121.0 GB disk0s2 3: Apple_Boot Boot OS X 134.2 MB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER ...

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.

To erase and partition an internal disk so you can install a bootable copy of the Mac OS, restart your Mac and hold down "Command-R" to enter Recovery mode so you can use its copy of Disk Utility.

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.