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Optical disc surface, SEM

Optical disc surface, SEM

T515/0290

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Credit

EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY

Caption

Optical disc surface. Light micrograph of the surface of an optical disc. Compact discs (CDs) and digital versatile discs (DVDs) are examples of optical discs. An optical disc digitally stores data, such as music and films, as tiny depressions (blue) in a plastic disc (white). Each depression is either long or short, each representing a bit. Eight bits form a byte. CDs can hold millions of bytes of data. DVDs can hold billions of bytes of data. The data track is about 0.5 micrometres wide, and is several kilometres long. The information is read by a laser light that reflects from a metal layer, allowing the original data to be reconstructed. Magnification: x666 when printed 10cm wide.

Release details

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