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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 a space
between them, starting with 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.
Lead-in and lead-out
These 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 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
Data
One track
One session
Lead-in Lead-out
Example: Ordinary CD-ROM
No data can be added even if
there is free space left on the disc.
0
Audio
data
Track 1
Lead-in Lead-out
Example: Audio CD
No data can be added even
if there is free space left on
the disc.
Audio
data
Track 2
Audio
data
Track 3
Audio
data
Track 4
Audio
data
Track 5
Audio
data
Track 6
Audio
data
Track 7
One session