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Session-at-Once (SAO)
This mode is used when writing each session in a single pass without pausing. More
sessions can be added later if there is enough space left on the disc.
n With CD Extra, the audio is written in the first session and the data is written in the second.
A maximum of 99 tracks can be written.
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 which specifically supports
packet writing, such as Adaptec’s DirectCD.
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.
1 2 3 4 5 6 7 8
. . . . . . . . . . . .
Packet
Same as writing to floppy or hard disk
Audio Audio Audio Data
Track 1 Track 2
(Session 1)
Track 3 Track 4
(Session 2)
Example: CD Extra
Appendix
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