Other fields contain metadata such as the volumes name and creator, along with the size and number of logical blocks used by the file system.
The rest begins with a volume descriptor set (a header block which describes the subsequent layout) and then the path tables, directories and files on the disc.Īn ISO 9660 compliant disc must contain at least one primary volume descriptor describing the file system and a volume descriptor set terminator which is a volume descriptor that marks the end of the descriptor set. Subsequent amendments to the standard were published in 20. High Sierra was adopted in December 1986 (with changes) as an international standard by Ecma International as ECMA-119 3 and submitted for fast tracking to the ISO, where it was eventually accepted as ISO 9660:1988. To facilitate cross platform compatibility, it defined a minimal set of common file attributes (directory or ordinary file and time of recording) and name attributes (name, extension, and version), and used a separate system use area where future optional extensions for each file may be specified. Since the specification is available for anybody to purchase, 1 implementations have been written for many operating systems.