Editing Optical disc (section)

===Second-generation===
Second-generation optical discs were for storing great amounts of data, including broadcast-quality digital video. Such discs usually are read with a visible-light laser (usually red); the shorter wavelength and greater [[numerical aperture]]<ref name="Crutchfield Advisor">[http://www.crutchfieldadvisor.com/S-UNO5yLxzuZf/learningcenter/home/hd_blu.html?page=2 Format War Update: Blu-ray Wins Over HD DVD] {{webarchive|url=https://web.archive.org/web/20080110072357/http://www.crutchfieldadvisor.com/S-UNO5yLxzuZf/learningcenter/home/hd_blu.html?page=2 |date=2008-01-10 }}. Crutchfieldadvisor.com. Retrieved on 2011-10-09.</ref> allow a narrower light beam, permitting smaller pits and lands in the disc. In the DVD format, this allows 4.7&nbsp;GB storage on a standard 12&nbsp;cm, single-sided, single-layer disc; alternatively, smaller media, such as the [[DataPlay]] format, can have capacity comparable to that of the larger, standard compact 12&nbsp;cm disc.<ref>{{cite web|title=Optical Carriers|url=http://webworld.unesco.org/safeguarding/en/pdf/txt_opti.pdf|url-status=dead|archive-url=https://web.archive.org/web/20151214233640/http://webworld.unesco.org/safeguarding/en/pdf/txt_opti.pdf|archive-date=2015-12-14|access-date=2013-11-27}}</ref>

* [[DVD]] and derivatives
** [[DVD-Audio]]
** [[DualDisc]]
** [[DIVX|Digital Video Express]] (DIVX)
** [[DVD-RAM]]
** [[DVD±R]]
* [[Nintendo optical discs#GameCube Game Disc|Nintendo GameCube Game Disc]] (miniDVD derivative)
* [[Nintendo optical discs#Wii Optical Disc|Wii Optical Disc]] (DVD derivative)
* [[Super Audio CD]] (SACD)
* [[Enhanced Versatile Disc]]
* [[DataPlay]]
* [[Hi-MD]]
* [[Universal Media Disc]] (UMD)
* [[Ultra Density Optical]]

====DVD-ROM====

In 1995, a consortium of manufacturers (Sony, Philips, [[Toshiba]], [[Panasonic]]) developed the second generation of the optical disc, the [[DVD]].<ref>{{cite thesis|last=Hawan Kim|first=Sung|title=June 2004|url=http://dspace.mit.edu/bitstream/handle/1721.1/17865/56611707.pdf|publisher=Massachusetts Institute of Technology|url-status=live|archive-url=https://web.archive.org/web/20131204001454/http://dspace.mit.edu/bitstream/handle/1721.1/17865/56611707.pdf|archive-date=2013-12-04|year=2004|type=Thesis}}</ref> The [[DVD]] disc appeared after the CD-ROM had become widespread in society.