HP-UX Reference (11i v3 07/02) - 4 File Formats (vol 8)

cdrom(4) cdrom(4)

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 charac-

ters, 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 per-

formance 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.