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| Glossary |
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Amorphous structure
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Structure in which material does not have a fixed
crystalline structure and its atomic arrangement is disorderly. |
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Dielectric layer
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Layer that changes the reflection coefficient of
a laser beam
In addition, using chemically stable material protects the disc from moisture
and oxygen. |
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| DVD |
Digital Versatile Disc
"Versatile" means multi-purpose. |
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| DVD Forum |
International organization that defines the DVD
standards and aims to promote and familiarize them.
Hardware manufacturers, software firms and media suppliers all around the world
have registered themselves as members.
"DVD Forum" Homepage >> http://www.dvdforum.com/forum.shtml |
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| DVD+RW Alliance |
International organization, independent from "DVD
Forum", that advocates the standards emphasizing the importance of rewritable
features and playback compatibility.
PC manufacturers, optical storage and consumer electronics manufacturers all around
the world have registered themselves as members.
"DVD+RW Alliance" Homepage >> http://www.dvdrw.com/ |
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Groove
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Guide track curved on the surface of a disc at the
factory as a tracking guide of a laser beam for recording and playing back data. |
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| Lossless Linking Technology |
Using this technology realizes seamless (without
any gap) recording even if data is added to the disc with recorded data or data
is edited on it. |
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Phase change optical disc
|
Disc that allows recording data by changing the
recording layer from the amorphous status to the crystalline status and playing
it back using the difference of reflection coefficient. |
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| Pit |
Bumps and dips created on the recording surface
(track) of a disc, which a laser reads as digital signals. They contain such information
as addresses and control tracks. |
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| Protective layer |
Layer that protects the recording layer of a disc
from moisture, oxygen, blemishes, etc. The layer is evenly coated with the use
of the spin coat method. |
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Reflective layer
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Layer in a disc that reflects laser beams that
passed through the recording layer. |
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| Rewritable type |
Disc to which data can be repeatedly written
Data is rewritable to DVD-RW and DVD+RW about 1000 times. |
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RWPPI:
RW
Products
Promotion
Initiative |
RW means "Rewritable".
RWPPI is an action organization with the aim to effectively popularize and promote
DVD-R and DVD-RW products, commercial products that are developed on the basis
of DVD-R and DVD-RW standards that allow recording and playback of DVD discs.
RWPPI's homepage >> http://www.rwppi.com/ |
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Track
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Spiral recording portion on a disc. |
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Tracking
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Mechanism that controls the optical pickup of a
drive so that it can record and play back data with the preciseness of a target
value on the track of a disc. |
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Video mode: DVD-Video format
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One of the recording formats (standards) for DVD
recorders, putting emphasis on playback compatibility with the current DVD players.
In this mode, however, it is difficult to edit the recorded data or write data
later. |
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VR mode: DVD-Video recording format
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One of the recording formats (standards) for DVD
recorders. It was developed for video recorders. In this mode, therefore, it is
easy to edit the recorded data or to write data later.
Since the data recorded to a disc in the "VR mode" cannot be played back with
general DVD players, however, it should be saved in the "Video mode". |
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Write-once type
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Disc to which data can be written only once. |
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