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This
article explains about what is a DVD, what are different forms of a DVD such as
DVD+R, DVD-R, DVD+RW, DVD-RW and differences between them.
DVD is
a high capacity version of the CD-ROM but similar in size as of CD-ROM.We can
say that DVD actually took the video into digital age.
A DVD is a digital video
disk which is used for producing digitized, compressed form of information and one
DVD can store information on 25 CD-ROMs approximately. Also the picture delivered
with a DVD is very impressive.
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There
are
(a) Single
sided, single layered discs with storage capacity of 4.7 GB
(b) Single
sided, two layer discs with capacity 8.5 GB and
(c) Double
sided, two layer discs with capacity of 17 GB.
All DVD
drives can read any CD. But a DVD-ROM drives can only read DVDs but cannot read
and write the data to other DVDs.
The R
format discs like DVD+R or DVD-R can only be written once, and cannot be erased
for ever. While RW format discs like DVD-RW or DVD+RW can be written to and erased
multiple times.
DVD-R
and DVR-RW were developed by Pioneer and used by Apple. These can be written only
in one layer on the surface of the disk. DVD+R and DVR+RW were supported by companies
like Microsoft, Sony, and Dell etc. These can be written to in many layers.
Generally DVD-R, DVD-RW are cheaper and have low
disc storage capacity than DVD+R, DVD+RW.
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