Optical disc
In computing, sound reproduction, and video, an optical disc is flat, circular, usually polycarbonate disc whereon data is stored. This data is generally accessed when a special material on the disc (often aluminum) is illuminated with a laser diode.
The first optical disc was the video laserdisc created by Philips, appearing as early as the late 1960s, but not marketed until the mid-1970s. The knowledge gained from this development led to the creation of the compact disc in 1980. The promotion of standardised optical storage is undertaken by the Optical Storage Technology Association (OSTA).
The information on an optical disc is stored sequentially on a continuous spiral track from the innermost track and outwardmost track.
Types of disc
There are many standards using optical discs:
External link
- Optical Storage Technology Association (http://www.osta.org)
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