Yamaha CRW8424E Appendix, Writing Modes, Disc-at-Once(DAO), Track-at-Once(TAO)

Appendix

Writing Modes

Disc-at-Once (DAO)

This mode is used when writing a complete disc in a single pass without pausing. Data cannot be added later, even if the full capacity of the blank disc has not been used.

Example: General CD-ROM

0

650MB

Data

Track 1

Any remaining space

Session 1

cannot be used

Lead-in

Lead-out

Example: Audio CD

0

650MB

Audio

Audio

Audio

Audio

Audio

Audio

Audio

Track 1

Track 2

Track 3

Track 4

Track 5

Track 6

Track 7

Any remaining space

cannot be used

Session 1

-in

Lead

Lead-out

The lead-in and lead-out areas signify the beginning and end points of a session. They are not part of the data but contain information about the session itself. Basically, a session consists of a lead-in, data, and a lead-out.

Track-at-Once (TAO)

This mode is used when writing data to a disc one track at a time. More tracks can be added later if there is enough space left on the disc. This is why Track-at-Once mode is sometimes referred to as Multisession.

0							650MB
	Data		Data		Data
	Track 1		Track 2		Track 3
	Session 1	Session 2		Session 3		Any remaining space
						can be used
Lead-in	Lead-out		Lead-out		Lead-out
	/Lead-in		/Lead-in

Only the first session of a multisession disc can be played back on a conventional audio CD player. Single session discs can be played back completely.

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