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Appendix
Disc-at-Once (DAO)
This method is used to write all data onto a disc in one operation. This method writes
multiple pieces of data successively without placing space between them, starting in
the innermost track of the disc. Once data is recorded by this method, no data can be
added to the same disc even if there is enough space left on it. This method is very
useful for making a backup copy of an entire CD.
About lead-in and lead-out
Refer to signals written on a disc to indicate the start and end points of a session, respectively.
These signals are not included in the data, but they are written in the same session as session
management information. In other words, a session is made up of a lead-in, data, and a lead-out.
Recording Methods
0
Example: Ordinary CD-ROM
Data
One track
One session
No data can be added
even if there is free
space left on the disc.
Lead-in Lead-out
0
Example: Audio CD
Audio
data
Track 1
One session
No data can be added
even if there is free
space left on the disc.
Lead-in Lead-out
Audio
data
Audio
data
Audio
data
Audio
data
Audio
data
Audio
data
Track 2 Track 3 Track 4 Track 5 Track 6 Track 7