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C156-E228-02EN GL-1
Glossary
Axial acceleration
Acceleration in the recording layer along the line perpendicular to the disk
reference surface at a specified rotation speed. Axial acceleration is detected by
optical means.
Axial displacement
A displacement at a point in the recording layer in a direction perpendicular to the
disk reference surface from its standard position. The standard position in the
recording layer is detected optically using the thickness and refraction rate of the
protective layer, based on the disk reference surface.
Case
A cover of an optical disk. The case protects the disk from being damaged during
handling and also allows the operator to replace disks easily. The case also
provides for a label, write protection tab, automatic handling support, and media
identification hole.
CDB (Command Descriptor Block)
A series of data describing input-output commands. The CDB is sent from the
initiator to the target.
Clamp area
A disk ring area on which the clamp mechanism applies a clamp force.
Command
An input-output instruction to the target. Described as CDB.
Control track
A track used to store media parameters and format information required to record
and read data to or from an optical disk.
Defect management
In real time processing mode, defect management refers to an automatic program
used to change the power, focus, tracking of reading and recording if an error is
detected and used to decide whether numerous error sectors should be discarded.
In batch mode, defect management refers to a guideline used to re-record or save
data in a disk.