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Technical Notes
39
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.
Note