Appendix
Recording Methods
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.
Example: Ordinary
0
|
|
| Data |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| One track |
|
| No data can |
| be added even if | |
|
|
|
| ||||||
|
|
| One session |
|
|
| |||
|
|
|
|
| |||||
|
|
|
|
|
| there is free space left on the disc. | |||
|
|
|
|
|
| ||||
Example: Audio CD
0
| Audio |
| Audio |
|
| Audio |
| Audio |
|
| Audio |
|
| Audio |
| Audio |
|
|
|
|
| |||||||||||
|
| data |
|
| data |
|
| data |
|
| data |
|
| data |
|
| data |
|
| data |
|
|
|
|
| |||||||
| Track 1 |
| Track 2 |
| Track 3 |
| Track 4 |
| Track 5 |
| Track 6 |
| Track 7 |
|
|
|
| |||||||||||||||
|
|
|
|
|
|
|
|
|
|
| ||||||||||||||||||||||
|
| |||||||||||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| No data can be added even | |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| if there is free space left on | |||
|
|
|
|
|
|
|
|
|
| One session |
|
|
|
|
|
|
|
|
| |||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| the disc. | |||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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
39