Fujitsu MCE3064AP Glossary, Axial acceleration, Axial displacement, Case, Clamp area, Command

Glossary

Axial acceleration

Acceleration on the recording layer along with the line perpendicular to the disk reference surface to a specified rotation speed. Axial acceleration is detected by optical means.

Axial displacement

A displacement at a point on the recording layer in a direction perpendicular to the disk reference surface from its original standard position. The standard position on the recording layer is detected optically using the thickness of the protective layer and refraction rate based on the disk reference surface.

Case

A cover of the optical disk. The case protects the disk from being damaged during handling and also allows the operator to exchange disks easily. The case also contains a label, write protection tab, automatic handling support, and media identification hole.

CDB (Command Descriptor Block)

A series of data describing input-output commands. CDB is sent from the initiator to the target.

Clamp area

A ring area on the disk on which a clamp force is applied by the clamp mechanism.

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 the optical disk.

Defect management

In real time, an automatic program used to change the power, focus, tracking of reading and recording if an error is detected and to decide if

many error sectors should be discarded. In batch mode, a guideline used to re-record or save the disk.

Disk reference surface

An ideal flat ring surface of an ideal spindle that is in contact with the clamp area on the disk. It is perpendicular to the rotation axis.

Error correction code

An error correction code designed to correct specific errors in data.

Error detection and correction

A series of data by adding a redundant code to data in the existing format. In read mode, the decoder removes a redundant code and detects and corrects errors using redundant information.

Interleaving section

A process that physically arranges data units so that data resists burst errors.

LUN (Logical Unit Number)

A device address used to identify a logical unit.

Recording layer

A layer on the disk on which data is recorded at production or recording .

Recording power

An incidence power specified on the incidence surface. Used to form marks.

Sense code

A single-byte code set in sense data. This information is used to determine the type of error detected.

Sense data

Information generated by the target to report detailed error information if any error information is contained in the command end status.

C156-E142-02EN GL - 1