- History of optical storage media
Although research into
optical data storagehas been ongoing for many decades, the first popular system was the Compact Disc, introduced in 1982, adapted to data storage (the CD-ROMformat) with the 1985 Yellow Book, and re-adapted as the first mass market optical storage medium with CD-Rand CD-RW in 1988. Compact Disc is still the "de facto" standard for audio recordings, although its place for other multimedia recordings and optical data storage has largely been superseded by DVD. DVD(initially an acronymof "Digital Video Disc", then backronymed as "Digital Versatile Disc" and officially just "DVD") was the mass market successor to CD. [ [http://www.pcmag.com/encyclopedia_term/0,2542,t=backronym&i=56302,00.asp backronym Definition ] ] DVD was rolled out in 1996, again initially for video and audio. DVD recordableformats developed some time later: DVD-Rin late 1997and DVD+Rin 2002. Although DVD was initially intended to prevent a format warin fact one did arise between these two formats. It was resolved with both surviving however: DVD-R predominating for stand-alone DVD recorders and players, and (for computers) most DVD devices being engineered as dual format, to be compatible with both. As of 2007DVD is the "de facto" standard for pre-recorded movies, and popular storage of data beyond the capacity of CD.
With the development of
high definition television, and the popularization of broadbandand digital storage of movies, a further format development took place, again giving rise to two camps: HD DVDand Blu-ray Disc, based upon a switch from red to blue-violet laser and tighter engineering tolerances. As of 2007both have significant releases in the pre-recorded movie sector, but they are still only commencing their roll-out for data storage and more general use, and have as yet made little impact on the global market for data storage. After suffering a number of significant losses to Blu-ray, Toshiba announced their withdrawal from HD DVD on February 19, 2008. As of 2007, future development beyond HD DVD and Blu-ray Disc appear to be based upon one or more of the following technologies, all in varying stages of development:
Holographic data storage.
3D optical data storage.
* Nearfield optics.
* Solid immersion optics (allowing an extremely high
* Discs utilizing very short wavelengths such as UV or
* Layer selection discs (
* Multi-level technology.
* Complex pit shapes allowing multiple channels to be stored on one track.
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