Appendix
30
Session-at-Once (SAO)
As a writing method that combines the advantages of the above-mentioned “Disc-
at-Once” and “Track-at-Once,” you can combine multiple tracks into one session
and write them, and then add additional data.
For example, this is the writing method used to create a CD EXTRA format CD.
The music tracks will be recorded in the first session, and the data will be
recorded in the second session.
Lead-in
Lead-out
Lead-out
/Lead-in
Data
Audio
Audio
Audio
0
Track 1
Track 2
Track 3
Track 4
Session 1
Session 2
Example: CD EXTRA
Packet Writing
This mode is used when writing to a track of a disc using small blocks of data
called “packets,” in a manner similar to a floppy disk. This mode is useful when
making small incremental backups of data. You will need to use software that
specifically supports packet writing, such as Adaptec’s Direct CD.
1
2
3
4
5
6
7
8
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Packet
Same as writing to floppy or hard disk
n
Discs must be formatted before they can be used for packet writing. With CD-RW,
erased data can be overwritten until the disc is completely full.
With CD-R, the space used by the erased data cannot be reused and is “masked” so that
it is no longer visible. This can be done up to 100 times.
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