Audio Compact Disc File

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

A standard audio CD is a 120 mm (4.7 in) circular disc composed of several layers: audio compact disc

: Microscopic depressions called pits and flat areas called lands are pressed into the plastic. : A film of acrylic lacquer seals the

: A 1.2 mm thick layer of clear polycarbonate plastic . audio compact disc

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