Fujitsu MCM3064AP User Manual download pdf (Page 187)

C156-E227-01EN 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.

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Fujitsu MCM3064AP User Manual Page 187