Technical Notes
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Disc-at-Once (DAO)
This method is used to write all data onto a disc in one operation. It writes multiple
pieces of data without placing a space between data, starting with the innermost
track of the disc. Once data is written by this method, no data can be added to the
same disc even if there is free space available on the disc. This method is useful for
making a backup copy of an entire disc.
Track-at-Once (TAO)
This method is used to write data on a disc on a track-by-track basis. A track can be
defined as the smallest unit of area that contains an ordinary program, image file,
text file, etc. This method enables you to add data to the same disc, one track of data
at a time, as long as there is free space available on the disc. A disc that contains data
written in several sessions is defined as a multi-session disc.
An area that records data and management information (Lead-in/Lead-out) is
defined as a session. Lead-in and Lead-out are signals written for stating the starting
and ending points of one session.
Ordinary audio CD players can only play back single-session discs or the first session on
a multi-session disc. Do not record audio data on the second and subsequent sessions.
Session-at-Once (SAO)
This method is used to write data on a disc on a session-by-session basis. Unlike
Track-at-Once described above, Session-at-Once enables you to record multiple
tracks onto a disc at a time. CD EXTRA, for example, uses this method to write
multiple pieces of audio data (or multiple tracks) in the first session and information
required for computers in the second session. This method enables you to add data
into the same disc, one session at a time, as long as there is free space available on
the disc. A disc that contains data written in several sessions by this method is
defined as a multi-session disc, like a disc written by the Track-at-Once method.
Writing Methods
Note
