Disk-based file systems are stored on physical media such as hard disks, CD-ROMs, and diskettes. Disk-based file systems can be written in different formats. The available formats are the following:
Disk-Based File System |
Format Description |
---|---|
UFS |
UNIX file system (based on the BSD Fast File system that was provided in the 4.3 Tahoe release). UFS is the default disk-based file system for the Solaris operating system. Before you can create a UFS file system on a disk, you must format the disk and divide it into slices. For information on formatting disks and dividing disks into slices, see Chapter 32, Managing Disks (Overview). |
HSFS |
High Sierra, Rock Ridge, and ISO 9660 file system. High Sierra is the first CD-ROM file system. ISO 9660 is the official standard version of the High Sierra File System. The HSFS file system is used on CD-ROMs, and is a read-only file system. Solaris HSFS supports Rock Ridge extensions to ISO 9660, which, when present on a CD-ROM, provide all UFS file system features and file types, except for writability and hard links. |
PCFS |
PC file system, which allows read and write access to data and programs on DOS-formatted disks that are written for DOS-based personal computers. |
UDF |
The Universal Disk Format (UDF) file system, the industry-standard format for storing information on the optical media technology called DVD (Digital Versatile Disc or Digital Video Disc). |
Each type of disk-based file system is customarily associated with a particular media device, as follows:
UFS with hard disk
HSFS with CD-ROM
PCFS with diskette
UDF with DVD
These associations are not, however, restrictive. For example, CD-ROMs and diskettes can have UFS file systems created on them.