CD-ROM File System

Digital UNIX Version 4.0 supports the ISO-9660 CDFS standard for data interchange between multiple vendors; High Sierra Group standard for backward compatibility with earlier CD-ROM formats; and an implementation of the Rock Ridge Interchange Protocol (RRIP), Version 1.0, Revision 1.09. The RRIP extends ISO-9660 using the system use areas defined by ISO-9660 to provide mixed-case and long filenames; symbolic links; device nodes; deep directory structures (deeper than ISO-9660 allows); UIDs, GIDs, and permissions on files; and POSIX time stamps.

This code was taken from the public domain and enhanced by Digital.

In addition, Digital UNIX Version 4.0 also supports X/Open Preliminary Specification (1991) CD-ROM Support Component (XCDR). XCDR allows users to examine selected ISO-9660 attributes through defined utilities and shared libraries, and allows system administrators to substitute different file protections, owners, and file names for the default CD-ROM files.