Iso Sets - Philips CDD522 Operating Instructions Manual

liberal naming (in addition to the possibility to append data —
(see "Appending Data to on iSO Set" p 41).
As the Frankfurt Proposal is still in the standardization process,
the only way today to mimic the file system, is to make the native
filenames with ISO 9660 in mind.
ISO SETS
On a CDROM disk, there is at least one file system. As with hard
disks, there could be more than one partition of the CDROM,
each of them containing one and only one file system. There are
various ways to partition the CDROM. To avoid multiple (and
hence incompatible) implementations of the same feature, these
possibilities are limited to a very few.
Partitioning the disks into ISO Sets should always be done by
using Sessions. A Session is a Leadin + a Program Area + a
Leadout — (see "The Physical Structure" p 16). Although a single
ISO set can be extended over more than one session, one
particular session can never contain more than one ISO set.
An ISO 9660 Set is characterized by the following elements:
- a Primary Volume Descriptor (PVD). It can always be
found at the 16th sector on the session. It is the hook
of the filesystem to the medium. It refers to the Path
Table, and to the Root Directory.
- The Path Table (PT). It contains the addresses for
the Directory Files. As such, it is used to directly
access the data files.
- The Root Directory (RD). This is a special Directory
File, in that no other Directory file refer to it.
- The Directory Files (DF). It contains the addresses to
its subdirectories and datafiles.As such, it is used to
descend through the directory trees.
- The datafiles contain the actual data.