Philips CDD522 Operating Instructions Manual page 47

FIG.11 [SO 9660 set over multiple sessions
Session 2
a See ae
ERED
Files Files 4
SS ae,
in header
In Figure 11, there is one single |SO file system over two
separate sessions: the PVD, Path Table and Directory Files are
allowed to refer to data recorded in a previous session. Please
note the arrow from the root directory of the second session to
the directories in the first session. This makes directory "A" and
"B" known as a member of the file set in the second session. In
Figure 12. the file sets of session 1 and session 1+2 are given.
FIG.12 Directory trees for the above
\ "Root" \ "Root"
session 1 session 2
The key in this approach is the fact that all addressing is done
absolute over all sessions. Addresses of the sectors are unique:
numbering of the sectors continue over the sessions, as shown in
lower half of Figure 11. This allows the extension of one iso set
over more session.