HP-UX Reference (11i v2 03/08) - 4 File Formats (vol 8)

c
cdrom(4) cdrom(4)
Level 1 The system is permitted to ignore supplementary volume descriptors, their associated
path tables, and all directory and file data associated with them.
Level 2 No restrictions apply.
In all cases, receiving systems must fulfill the receiving system requirements specified in section 10 of the
ISO standard (no equivalent section exists for HSG).
Interchange levels provide a way to specify the data structure and complexity that exists on a CD-
ROM.
The levels are:
Level 1 Each file consists of a single file section. File names contain no more than eight char-
acters, and file name extensions contain no more than three. Directory names contain
no more than eight characters.
Level 2 Each file consists of a single file section.
Level 3 No restrictions apply.
DEPENDENCIES
HP-UX supports only the primary volume descriptor. When a volume is mounted, HP-UX mounts the
directory hierarchy described by the first primary volume descriptor it finds. Supplementary volume
descriptors are recognized and ignored, as are their associated directory hierarchies.
Directory hierarchies spanning multiple volumes are not supported.
Volume sets consisting of more than one volume are not supported.
Path tables are ignored in HP-UX. The normal path name lookup scheme used in HFS file systems is
used instead. This is done to allow other mountable file systems to be mounted on top of a mounted
CDFS file system. Also, since HP-UX maintains a cache of cdnodes for CDFS files (see cdnode (4)), the
additional performance gains provided by path tables are minimal.
HP-UX does not support multiple file sections. Each file must be recorded in a single file section.
HP-UX supports level 1 implementation and level 2 interchange.
NOTES
Additional CD-ROM formats are supported using PFS (Portable File System) utilities. See pfs (4) for
more details.
SEE ALSO
fsctl(2), stat(2), cdnode(4), pfs(4).
Information Processing - Volume and File Structure of CD-ROM for Information Interchange , Ref. No.
ISO 9660: 1988 (E).
The Working Paper for Information Processing − Volume and File Structure of Compact Read Only Opti-
cal Discs for Information Interchange , National Information Standards Organization [Z39].
Section 4−−30 Hewlett-Packard Company − 4 − HP-UX 11i Version 2: August 2003