To see the format of the external drive, right-click on the icon and select Properties (Windows) or Get Info (Mac) During development, Apple referred to this filesystem with the codename Sequoia. HFS Plus is also referred to as Mac OS Extended (or, erroneously, “HFS Extended”), where its predecessor, HFS, is also referred to as Mac OS Standard (or, erroneously, as “HFS Standard”). It is also one of the formats used by the iPod digital music player. HFS Plus or HFS+ is a file systemdeveloped by Apple Inc. to replace their Hierarchical File System (HFS) as the primary file system used in Macintoshcomputers (or other systems running Mac OS). Macs can handle some Windows formats, but Windows cannot handle HFS+ without additional software. All you really need to know is that they are just three different methods for storing information. Mac OS X uses Mac OS Extended also known as HFS+.
