Yamaha CRW2200UX manual Track-at-Once TAO, Session-at-Once SAO

Appendix

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, pictorial data, text data, etc. This method allows you to add data to the same disc, one track of data at a time, as long as there is free space left on the disc. Discs that contain data recorded in several different sessions (writing of tracks) are referred to as multi- session discs.

0

Data

Data

Data

		Track 1		Track 2	Track 3
	1st session		2nd session		3rd session
Lead-in		Lead-out		Lead-out	Lead-out
		/Lead-in		/Lead-in

Data can be added if there is free space left on the disc.

Note

Multi-session discs cannot be played on any ordinary audio CD players, except when data is recorded in a single session (or except for the first session).

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 on the previous page, Session-at-Once allows you to record multiple tracks onto a disc at a time. CD EXTRA, for example, uses this method to record multiple pieces of audio data (or multiple tracks) in the first session and information required for computers in the second session. This method allows you to add data to the same disc, one session at a time, as long as there is free space left on it. As is the case with discs containing data recorded by Track-at-Once method, discs containing data recorded by this method can also be called multi-session discs, provided that data is written in several different sessions.

Example: CD EXTRA

0

Audio

data

Audio

data

Audio

data

Audio data

Track 1

Track 2

Track 3

Track 4

1st session

2nd session

Lead-in Lead-out/Lead-in Lead-out

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