Glossary


A-B             C-D             E-L            M-P            R-Z


 E

E11
A type E11 error indicates the loss of only one recoverable data bit.

E12
A type E12 error indicates the loss of only one recoverable data bit by the second decoder.

E21
A type E21 error indicates the loss of two recoverable data bits.

E22
A type E22 error indicates the loss of two recoverable data bits by the second decoder.

E31
A type E31 error indicates the number of non-recoverable errors by the first decoding algorithm.

E32
A type E32 error indicates some irretrievable errors by the second decoder. A working disc cannot have this type of error.

ECC (Error Correction Code)
An algorithm through which data lost as a result of an error can be reconstituted.

ECC (Eccentricity)
The difference in the size of the center of the disc and the center of the spiral. In CDs it is ± 70 µ but should be ± 50 µ in CD-ROMs, as they are read in a much less methodical way than CD-Rs.

EDC (Error Detection Code)
Error detection algorithm.

Electroforming
Technical procedure for creating a metal or master mask for continuous production of CDs from a glass matrix.


  F

Form1
Mode 2 CD-ROM sub-format used for Photo - CDs and electronic books.

Form2
Mode 2 CD-ROM sub-format used for applications where data will not suffer from low correction levels (video, sound).


  G

Glass Master
The first recorded media and used for the CD, DVD, or Blu-ray duplication. A photosensitive film is applied to the glass master and data is written with a laser. The film applied to the exposed glass master gives the master information.

Green Book
The standards applying to CD-I


  H

Header field
4 bits at the beginning of every CD-ROM sector. The header gives the sector address amd recording method.

High Sierra
A file organization format on which ISO 9660 is based.


  I

IG (Intensity Groove)
Measure of the percentage of the reflectivity of the spiral. The figure is obtained by taking measurements at 10 points in the disc data area (measurements taken before and after recording: IGa and IGb ).

IL (Intensity Land)
Measure of the percentage of the reflectivity of the land. The figure is obtained by taking measurements at 10 points on the surface of the disc (measurements taken before and after recording: ILa and ILb).

Index
Easily-located points marked on a track.

Injection molding
Polycarbonate discs which form the basis of a CD, are created by injecting pressurized plastic into a mold.

ISO 9660
International norm describing computerized file organization on CDs.

ISRC (International Standard Recording Code)
An optional unique code assigned to a track. The ISRC value, situated in the Q channel, identifies a track by the re
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