What is the meaning of Disk-at-once?

What is the meaning of Disk-at-once?

Disk-at-once is the name of a format used for writing data to CD-R/RW and DVD-R/RW. It is the same writing format used for the press-type media (commercially available music CD and data CD-ROM).
The features of disk-at-once are as follows.

- Data cannot be added later.
- CD-ROM without gaps (silent portions) can be created.

Disk-at-once is different from the incremental writing formats (incremental track-at-once, session-at-once, packet writing, etc.) in that it completes the writing of data with single writing. Therefore, disk-at-once allows the creation of CD-ROM without gaps (silent portion between data), which is generated when data is written in incremental writing formats.

* "DirectCD" and "CDR-FS" are the packet writing software. Therefore, they cannot write data in the disk-at-once format even if you specify it.