Cd-R: The Physical Structure; Introduction - Philips CDD522 Operating Instructions Manual

CD-R: The Physical Structure
INTRODUCTION
Remark: Any unfamiliar expressions, used in this introduction, will
be explained later-on.
The Compact Disk has become a widely used data-carrier.
in its most generic form it is used to hold Audio data on so-called
CDDA disks (Compact Disk Digital Audio). That data is encoded
onto the disk using a two-layered Error-Detection/Correction
scheme (called First Layer Correction or C1 and Second Layer
Correction or C2) together with data-scrambling and interleaving.
The data-encoding is done according to The Red Book, the
World Standard to which ALL Compact Disks MUST comply.
"ALL" means here: all CDDA disks AND all Data disks.
Above this Red Book Format, others are situated for Data disks.
That disk-type is used in environments demanding an even
higher data reliability. Therefore, a third Error-
Detection/Correction is implemented, called Third Layer
Correction or C3. Furthermore, a data-structure must be
implemented to make easy data-retrieval possible.
The Data disks are described in several extra Books, each of
them covering an area of data-application:
The Yellow Book:Covers CDROM and CDROM-XA
Data Formats.
The Green Book: Covers CDI Data Formats and
Operating System.
Next to the Red, Yellow and Green Books exists another one: the
Orange Book. This book describes the format of the Orange
Disk that is used in the Write Once systems like the CDD522
Recorder.
This Orange Disk is NOT a disk among other Red, Yellow and
Green disks. This disk initially contains no reaf data (except for
some ATIP-code).
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