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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.
Example: CD EXTRA
Audio
Audio
Track 1
Track 2
Session 1
Lead-in
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.
1
2
3
4
5
Packet
Notes on Packet Writing
• 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.
• When using packet writing on a CD-RW disc, the actual data capacity is 100MB less than that
stated on the cover of the disc. The difference in capacity is dependent on the writing mode.
• 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.
Audio
Track 3
Lead-out
/Lead-in
.
.
.
6
7
8
Data
Track 4
Session 2
Lead-out
.
.
.
.
.
.
Same as writing to floppy or hard disk
Appendix
.
.
.
29
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