Audio Compact Disc Apr 2026

: A thin coating of aluminum (or gold) reflects the laser beam used for reading.

: Microscopic depressions called pits and flat areas called lands are pressed into the plastic. audio compact disc

A standard audio CD is a 120 mm (4.7 in) circular disc composed of several layers: : A thin coating of aluminum (or gold)

: A film of acrylic lacquer seals the reflective layer to prevent corrosion and physical damage. How It Works audio compact disc