2.5 Case Study: unix File System Layering and Naming 93 Table 2.2 The Naming Layers of the unix File System Layer Symbolic link layer Purpose Integrate multiple file systems with symbolic links. Provide a root for the naming hierarchies. Organize files into naming hierarchies. Provide human-oriented names for files. Provide machine-oriented names for files. Organize blocks into files. Identify disk blocks. user-oriented names Absolute path name layer Path name layer File name layer Inode number layer File layer Block layer machine-user interface machine-oriented names