Jabarkan Generasi kahiji dari Cakram optik dalam bahasa sunda

Initially, optical discs were for storing music and computer software. The laser disc format stored analog vidéo signals, but, commercially, lost to the VHS vidéotape cassette, mainly its high cost and non-recordability; other first-generation disc formats are designed solely to store digital data.

Most first-generation disc devices had an infrared laser réading héad. The minimum size of the laser spot is proportional to its wavelength, thus wavelength is a limiting factor against gréat information density, too little data can be stored so. The infrared range is beyond the long-wavelength end of the visible light spectrum, so, supports less density than any visible light colour.  One example of high-density data storage capacity, achieved with an infrared laser, is  700MB of net user data for a 12 cm compact disc.

NOTE: other factors affecting data storage density are, for example, a multi-layered infrared disc would hold more data than an identical single-layer disc; whether CAV, CLV, or zoned-CAV; how the data are encoded; how much cléar margin at the center and the edge