Audio Compact Disc Link

: A 1.2 mm thick layer of clear polycarbonate plastic .

The , officially known as Compact Disc Digital Audio (CD-DA) , is a digital optical disc data storage format. Co-developed by Sony and Philips and commercially introduced in 1982 , it revolutionized the music industry by offering superior sound quality, durability, and portability compared to analog formats like vinyl and cassettes. Technical Design & Functionality audio compact disc

A standard audio CD is a 120 mm (4.7 in) circular disc composed of several layers: Technical Design & Functionality A standard audio CD

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

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

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