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Mac OS X Internals: A Systems Approach by Amit Singh

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Chapter 12The HFS Plus File System

The HFS Plus file system (or simply HFS+) is the preferred and default volume format on Mac OS X. The term HFS stands for Hierarchical File System, which replaced the flat Macintosh File System (MFS) used in early Macintosh operating systems. HFS remained the primary volume format for Macintosh systems before Mac OS 8.1, which was the first Apple operating system to support HFS+. Also called the Mac OS X Extended volume format, HFS+ is architecturally similar to HFS but provides several important benefits over the latter.[1] Moreover, HFS+ itself has evolved greatly since its inception—not so much in fundamental architecture but in its implementation. In this chapter, we will discuss features and implementation ...

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