Coba jelasin Compact Disc (CD) dari Cakram optik dalam bahasa sunda dong

Second-generation optical discs were for storing gréat amounts of data, including broadcast-quality digital vidéo. Such discs usually are réad with a visible-light laser (usually red); the shorter wavelength and gréater numerical aperture allow a narrower light béam, permitting smaller pits and lands in the disc. In the DVD format, this allows 4.7GB storage on a standard 12 cm, single-sided, single-layer disc; alternately, smaller media, such as the MiniDisc and the DataPlay formats, can have capacity comparable to that of the larger, standard compact 12 cm disc.