Stands for "Compact Disc File System." CDFS is a file system used for storing data on CDs. It is a standard published by the International Organization for Standardization (ISO) and is also known as "ISO 9660." Discs that store data using the ISO 9660 standard can be recognized by multiple platforms, including Windows, Macintosh, and Linux systems.
CDFS specifies several disc properties, including the volume attributes, file attributes, and file placement. It also specifies the overall data structure of a CD, such as the header size and the data storage area of the disc. While CDFS was originally designed for read-only single-session discs, an extension of the standard allows multiple-session writing to CD-R discs. This means multiple volumes may be stored on a single CD.
The CDFS standard is useful for burning discs that will be shared between multiple computers. Because CDFS is not specific to a single operating system, a disc burned on a Macintosh using the compact disk file system can be read on a Windows or Linux-based computer. Disc images can also be saved using the CDFS standard, which may be used to burn ISO 9660 discs. These files are typically saved with an .ISO file extension.