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What is DVD?

By Ashutosh Bhatt

Often called as Digital Versatile Disc, or Digital Video Disc, it is another optical storage medium which allows much higher storage capacity than a Compact Disc while having the same physical dimensions. It uses a laser diode of 650nm wavelength in contrast to the 780nm laser of a CD thus enabling a smaller pit to be etched and hence higher storage capacity. It can be a single layer or a dual layer DVD offering 4.7 and 8.54 gigabytes per disc respectively. A dual layer disc involves the use of another physical layer within the disc.

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