Before any disk partition can be used, a filesystem must be built on it. When a filesystem is made, certain data structures are written to disk that will be used to access and organize the physical disk space into files (see Section 10.3, later in this chapter).
Table 10-1 lists the most important filesystem types available on the various systems we are considering.
Table 10-1. Important filesystem types
jfs or jfs2
ufs or advfs
 HP-UX defines the default filesystem type in /etc/default/fs’s LOCAL variable.
 This feature is deprecated and will be replaced by the
In the beginning was the System V filesystem. Well, not really, but that’s where we’ll start. This filesystem type once dominated System V-based operating systems.
The superblock of standard System V filesystems contained information about currently available free space in the filesystem in addition to information about how the space in the filesystem is allocated. It held the number of free inodes and data blocks, the first 50 free inode numbers, and the addresses of the first ...