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15.2.5 White Book
The second-most recent standard is known as the White Book. It
standardizes the video-CD. A video CD can store over 70 minutes of
playing time through the compression of the video data (with MPEG
1). The quality is about the same as that of a VHS video recorder. It
is not adequate for true movie quality with Dolby Surround. It will
probably not be until the next generation - the DVD (Digital Versatile
Disc, also frequently and incorrectly called Digital Video Disc) with
its even greater memory capacity - that this type of quality will be
achieved.
15.2.6 Blue Book
This is the most recent standard and was established in 1995. The
Blue Book describes the Enhanced Music CD, often called merely
CD-Enhanced, CD-Extra or simply by its logo, CD-Plus or CD +. The
enhanced Music CD is always a multi-session CD, or - to be more
precise - a two-session CD. The first session contains audio data as
defined by CD-DA (Red Book), the second contains a CD-ROM
(Yellow Book). This means that information other than audio data
may also be stored on one medium.
15.3 Definition of Concepts
15.3.1 Tracks
Data items on a CD are not stored in concentric circles, as one
might at first think. They are rather arranged in an extended spiral-
shaped line whose origin is at the center of the CD. The line runs
from the inside to the outside. Those sections on the spiral on which
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