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FREECOM Portable II Series
24
GB
5
TOC
Table of Contents, Directory of the CD. The table of contents documents not
only the number of tracks but also their starting position and the total length
of the data area of the disc.
Track
a track is a section of the CD. Every audio title has its own track. In contrast, all
the data of a data CD is contained within a single track. A Mixed-Mode CD has
a data track (track 1) and audio tracks. The data track cannot be played back
with an audio player. Older devices can produce a whistling sound which can
damage your stereo system. The data track for CDs conforming to the Blue
Book standard (CD-Extra, CD-Plus) is located at the end of the CD.
Track-at-Once
"Track-at-Once" is a method of writing by which all tracks are written individually.
For data CDs there is no significant difference to "Disc-at-Once"; however, a gap
of two seconds is appended to every track of an audio CD.
Some CD recorders can only write according to this method.
Virtual Image
The data structure of a CD is different to those of other media. The writing
program must first convert the data in to an appropriate form before it sends it
to the recorder. The virtual image is constantly updated during the writing
procedure. This requires a computer system with enough power to handle the
complexity of the data. The virtual image requires approx. 30MB of free hard
disk space. It is automatically deleted after the writing procedure. Writing with
virtual images is also known as "On-the-Fly." If problems occur (insufficient
data transfer rates), you should use physical images to separate the image
creation and data transfer/writing processes.
Yellow Book
Specification for CD-ROM (data CDs) and CD-ROM XA.