Compact disks


Compact discs. Falling compact discs leaving trails of color. Each disc stores data as a series of fine depressions representing a digitized signal capable of being read by a laser. To reflect the laser light, the data layer is coated with a fine film of metal which follows the depressions exactly. This layer is covered by layer of plastic which prevents dust and scratches from affecting the reading of the information.

Credit: Ken M. Johns / Science Source

Model Release: No, but may not be necessary

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