ISO 9660

File system for CD-R and CD-ROM optical discs

ISO 9660

ISO 9660 (also known as ECMA-119, or on Windows as CDFS) is a file system for optical disc media. The file system is an international standard available from the International Organization for Standardization (ISO). Since the specification is publicly available, implementations have been written for many operating systems.

From Wikipedia, under CC BY-SA. More on occurri.