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Glossary - LG GWA-4164B Service Manual

Dvd/cd rewritable drive
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ATIP
Absolute Time in Pre-groove. With an additional modulation of the "Wobble", the "Groove" contains a time
code information.
Wobble
The pre-groove in the Disc is not a perfect spiral but is wobbled.
With : – A typical amplitude of 30 nm
– A spatial peried of 54~64 µm
CW
Continuous Wave. The laser light output is at a constant level.
DOW
Direct Over-Write. The action in which new information is recored over previously recorded information in
CD-RW disc.
Overwrite
The action in which new information is recorded over previously recorded information.
(Pre-)Groove The guidance track in which clocking and time code information is stored by means of an FM
modulated wobble.
Land
Land is characterized in the following way:
When radial signals are concerned,land is defined as the area between the grooves.
When HF signal are concerned,land is defined as the area between the marks(pits) in tangential
direction.
Hybrid Disc A Multisession disc of which the first Session is mastered. On a hybrid disc, recorded and
mastered information may co-exist.
Mastered
Information,stored as pits on the disc during the manufacturing process of the disc.
Information (when making the master)
OPC
Optimum Power Control. Procedure is determined optimum recording power according to CD-
R/RW Media in recording start step.
ROPC
Running OPC. The purpose is to continuously adjust the writing power to the optimum power
that is required.
When the optimum power may change because of changed conditions of disc and change in
operating temperature.
Jitter
The 16 value of the time variation between leading and trailing edges of a specific (I3 ... I11) pit
or land as measured by Time Interval Analysis.
Deviation
The difference between a fixed value of Pit length and Land length.
TOC
Table Of Contents : in the Lead-in Area the subcode Q-channel contains information about the
Tracks on the disc.
Packet
A method of writing data on a CD in small increments.
Writing
Two kinds of packets can be written : Fixed-length and Variable-length.
Write
The shape of the HF write signal used to modulate the power of the laser.
Strategy
The Write Strategy must be used for recordings necessary for disc measurements.
Information Wobble, ATIP, Disc Identification, Write Power, Speed Range OPC Parameters, etc are
Area
recorded in the Information area of CD-RW Disc
Finalization The action in which (partially) unrecorded or logically erased tracks are finished and the Lead-in
and/or Lead-out areas are recorded or overwritten with the appropriate TOC subcode.
Logical Erase A method to remove information from a disc area by overwriting it with an EFM signal containing
mode 0 subcode
A logically erased area is equivalent to an unrecorded
Physical Erase The action in which previously recorded information is erased by overwriting with a CW laser
output.
After a Physical Erase action, the erased area on the CD-RW disc is in the unrecorded state
again.
Session
An area on the disc consisting of a Lead-in area, a Program area, a lead-out area.
Multi session A session that contains or can contain more than one session composed Lead-in and Lead-out
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GLOSSARY

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