DVD-RW is a rewritable optical disc with equal storage
capacity to a DVD-R, typically 4.7 GB. The format was developed by Pioneer
in November 1999 and has been approved by the DVD Forum. Unlike DVD-RAM,
it is playable in about 75% of conventional DVD players.
primary advantage of DVD-RW over DVD-R is the ability to erase and rewrite
to a DVD-RW disc. According to Pioneer, DVD-RW discs may be written to
about 1,000 times before needing replacement, making them comparable with
the CD-RW standard. DVD-RW discs are commonly used for volatile data, such
as backups or collections of files. They are also increasingly used for
home DVD video recorders. One benefit to using a rewritable disc is if
there are writing errors when recording data, the disc is not ruined and
can still store data by erasing the faulty data.
DVD-R, the DVD-RW standard has always dictated a capacity of 4.7 GB.
competing rewritable format is DVD+RW. Hybrid drives that can handle both,
often labeled 'DVD±RW', are very popular since there is not yet a single
standard for recordable DVDs.
recording layer in DVD-RW and DVD+RW is not an organic dye, but a special
phase change metal alloy, often GeSbTe. The alloy can be switched back and
forth between a crystalline phase and an amorphous phase, changing the
reflectivity, depending on the power of the laser beam. Data can thus be
written, erased and re-written.
Wikipedia information about
DVD-RW. This article is licensed under the GNU Free Documentation License . It uses material
from the Wikipedia article 'DVD-RW'
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