CD (Compact Disc) waa optical disc kaas oo loo adeegsado keydinta Digital data, markii hore waxaa loo isticmaali jiray keydinta codka oo kaliya waxeyna suuqyada soo gashay oktoobar 1982, CD caadiga ah dhumuc ahaan waa 120 mm. waxaa qoray Eng Abdulkadir Mohamed Yusuf The Compact Disc​—What Is It All About?