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C156-E142-02EN GL - 1
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.