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Chapter 9. Filesystem Overview > Mac OS X Filesystems

9.1. Mac OS X Filesystems

Like earlier versions of Mac OS, Mac OS X filesystems favor the Mac OS Extended Format, better known as HFS+ (Hierarchical File System),[1] but they also work well with the Universal File System (UFS) that most other Unix-based operating systems use as their primary filesystem.

[1] Mac OS 8.1 and later used HFS+, while versions prior to 8.1 used the older Mac OS Standard Format, known as just HFS (without the plus).

Most Mac OS X volumes use HFS+ as their format because it allows backward compatibility with legacy Mac files. They also use it because it supports multiple file forks (see the later section Section 9.1.2). Through strong UFS support, a Mac OS X machine can work seamlessly with other Unix volumes, such as network-mounted ones that may be accessible over NFS.


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