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date: 16 October 2019

compact disc [CD]. 

Source:
The Oxford Companion to Music
Author(s):
Lewis ForemanLewis Foreman

A 12-cm plastic disc on which digitally encoded signals are recorded in the form of a spiral pitted track running from the centre outwards. Compact discs, coated in a reflecting metal (usually aluminium) and sealed by a protective layer to prevent oxidization, are read by a precisely focused laser. Corrosion of the reflective surface caused by faults in the protective layer is known as ‘bronzing’. Discs are manufactured by stamping and pressing into a plastic sheet. The capacity of commercially manufactured discs allows up to 79 minutes per disc. Compact discs were developed jointly by Philips and Sony and introduced in ... ...

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