ONE Technologies
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CD-I). Mode 1 is used for pure CD-ROMs. It always employs an
additional code for error recognition and correction in order to
ensure that scratches or manufacturing defects do not have any
influence on the accuracy of the computer data.
Mode 2 is used with CD-ROM/XA (CD-ROM eXtended Architecture)
and CD-I (Compact Disc - Interactive, see below), for example, and
can be used for compressed audio data, videos, images and also for
other types of data, whereby the differing types of data may occur
within a single track. In addition, there is a differentiation between
Form 1 and Form 2 sectors. In Form 1 - as with Mode 1 - a
supplemental error recognition and correction code is used. It is only
the arrangement of the data that is somewhat different. Form 2 does
not make use of this additional protection. It is therefore only
suitable for data in which errors do not necessarily create an
interference (for example, with audio data).
A process which describes the way tables of contents for computer
data are filed on a CD is not defined in the Yellow Book. The most
frequently used method is defined in ISO 9660 and is supported by
most operating systems (Macintosh OS, MS-DOS and Windows,
and also UNIX, for example).
15.2.3 Green Book
After three more years had elapsed, the next standard was
introduced - the Green Book. This standard describes the CD-I
(Compact Disc - Interactive) and an operating system which is
known as CD-RTOS. The specification for the CD-I Bridge was also
published in the Green Book. Both standards represent an
extension to the Red and Yellow Books, and they are based on ISO
9660.
While the Audio-CD is only suited for music and the CD-ROM was
developed only for use with a computer, the CD-I is aimed at the
consumer market, although it has not achieved any wide-spread use
there, except in one specialized form: the Photo-CD.
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