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CD

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  1.       

    an optical disc used to store digital data

  2.       

    originally developed for storing digital audio

  3.       

    audio capacity is 74 minutes

  4.       

    a disc with a diameter of 115 mm

  5.       

    the capacity was set to 74 minutes to accommodate a complete performance of Beethoven’s 9th Symphony

  6.       

    is made from a 1.2 mm thick disc of almost pure polycarbonate plastic and weighs approximately 16 grams

  7.       

    audio format is a two-channel 16-bit PCM encoding at a 44.1 kHz sampling rate

  8.       

    data is stored as a series of tiny indentations (pits), encoded in a tightly packed spiral track molded into the top of the polycarbonate layer

  9.       

    spacing between the tracks, the pitch, is 1.6 μm

  10.       

    data capacity is 650 MB

  11.       

    read by focusing a 780 nm wavelength semiconductor laser through the bottom of the polycarbonate layer

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