ISO 9660 is a standard published by the International Standardization Organization and defines a type of file system for CD-ROM media. Its purpose is to support the interchange of data between different operating systems, such as Unix, Windows and Mac OS.

Joliet format is an ISO 9660 extension: it adds support to long filenames and non-ASCII character sets.

The ISO 9660 file system can also be used for DVD-ROM media, although in this case the UDF file system is more appropriate as it supports larger disk sizes and is more suited to the needs of modern operating systems.

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