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<p>ADigital Video Disc, plastic disc containing a recording of digital data that
can produce moving pictures when played in a special device attached to a computer
or an ordinary television set.</p>
<p>Discs for pre-recorded digital video, which are currently referred to as DVD-Video,
are just one part of a new family of standards for digital disc recording purposes
that the manufacturers concerned wish to call DVD; for copyright reasons they
claim that this is short for "digital versatile disc". The group of
DVD disc formats also includes various forms of data recording for computer
purposes, including discs that contain pre-recorded data (DVD-ROM) and discs
that can be rewritten many times (DVD-RAM). These will be several times the
capacity of existing CD-ROMs. The simple single-layer version of the DVD will
hold between 3.7 and 4.38 gigabytes (with double-layer versions holding 15.9
gigabytes), compared to the 650 megabytes of present CD-ROMs. These higher capacity
discs will be used particularly for computer games and in multimedia applications.</p>
<p>Digital video discs are a simple refinement of the existing laser video discs
and compact discs (CDs), as developed by Philips (Netherlands) and Sony (Japan).
However, other Japanese manufacturers have also become involved in developing
competing variants of the technology. All the forms of the new digital video
discs have the same external dimensions as CDs and CD-ROMs, that is, they are
120 mm (about 4½ in) in diameter and 1.2 mm thick, but the microscopic
pits in their surface that record the data are of roughly half the size and
spacing. The density of information that can be recorded on the disc surface
is thus increased several times; this increase has been made possible by more
perfect control of the laser-reading mechanism in the player, and also by using
a laser that produces light of a shorter wavelength.</p>
<p>The new video discs are being produced in four forms that contain either a
second recording layer on the other side of the disc, to be read by a second
laser, or a second recording layer below the semi-transparent surface of the
first recording, or both of these together. The technique of having two layers
on the same side of the disc depends on refocusing the laser beam reading the
discs so that the lower layer is read through the upper layer.</p>
<p>These possibilities double or quadruple the amount of information contained
compared to the simplest, single-sided, single-layered disc, and mean that longer
films, or alternative versions of the same film, can be contained on a single
disc. Also, using the system for compressing moving-picture data in digital
form that is to be used for digital broadcasting in Europe, it is possible to
put a recording of a two-hour film on one disc, and a four-hour film on a double-layer
disc, with roughly the same quality as that given by the existing 30-cm (12-in)
LaserVision videodiscs, which have finer definition than videotape.</p>
<p>For mass production of pre-recorded material, the single-sided, single-layer
discs are pressed in the same way as CDs are at present, for the same very low
production cost. However, the extra layers for the extended versions have to
be laminated together in a further production step, which increases their basic
cost somewhat.</p>
<p>Discs similar to digital video discs are to be produced for distributing recorded
sound, and these will contain either longer recordings or higher-quality recordings
than existing CDs. So far, complete agreement on the technical standards for
all types of DVD has not been reached, but nevertheless the manufacturers intend
that these alternatives will eventually take over from present-day CDs, CD-ROMs,
laser video discs, and even displace video cassette recorders for recorded video.<br>
</p>
<h2>soundtrack specialists, movie soundtracks, movie memorabilia, used laser
discs, film soundtracks, film memorabilia, mail order dvds, rare films,
hard to fin movies, movie search, dvd films, dvd movies</h2>
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