Essay on Document on Atta

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From Wikipedia, the free encyclopedia
This article is about the storage format. For the binocular vision condition, see Dissociated vertical deviation.
DVD logo.svg
DVD-R read/write side
Media type Optical disc
Capacity 4.7 GB (single-sided, single-layer – common)
8.5–8.7 GB (single-sided, double-layer)
9.4 GB (double-sided, single-layer)
17.08 GB (double-sided, double-layer – rare)
Read mechanism 650 nm laser, 10.5 Mbit/s (1×)
Write mechanism 10.5 Mbit/s (1×)
Standard DVD Forum's DVD Books[1][2][3] and DVD+RW Alliance specifications
Developed by Philips, Sony, Toshiba and Panasonic
Weight 16 g[4]
Optical discs
Optical media types[show]
See also[show] v t e
DVD (sometimes
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* Some CD-R(W) and DVD-R(W)/DVD+R(W) recorders operate in ZCLV, CAA or CAV modes, but most work in Constant linear velocity (CLV) mode.
Before the advent of DVD in 1995, Video CD (VCD) became one of the first formats for distributing digitally encoded films on standard 120 mm (4.7 in) optical discs. (Its predecessor, CD Video, used analog video encoding.) VCD was on the market in 1993.[10] In the same year, two new optical disc storage formats were being developed. One was the Multimedia Compact Disc (MMCD), backed by Philips and Sony, and the other was the Super Density (SD) disc, supported by Toshiba, Time Warner, Matsushita

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