Optical disc

Optical disc

T515/0266 Rights Managed

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530 pixels on longest edge, unwatermarked

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Uncompressed file size: 51.0MB

Downloadable file size: 2.4MB

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Caption: Optical disc. Compact discs (CDs) and digital versatile discs (DVDs) are examples of optical discs. An optical disc digitally stores music and other data as tiny depressions in a plastic disc. This disc is coated with a fine film of metal and then by another layer of plastic. The depressions form a spiral track moving from the centre of the disc to the outer edge. The data track is about 0.5 micrometres wide, and would stretch out for nearly 5 kilometres if unravelled. The information is read by a laser light that reflects from the metal layer, allowing the original data to be reconstructed.

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Keywords: audio sound, cd, cd-rom, colour, colours, communication, communications, compact disc, data storage, digital video, discs, disk, dvd, information, light, media, medium, music, optical, reflecting, reflection, reflections, sparkling, still life, still-life, technology, versatile, visual

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