Early compact discs were made at just two factories, owned by Philips and Sony.īefore the process became streamlined, individual discs cost $30, but as manufacturers proliferated, prices dropped. The first CD player, the CDP-101, was released commercially in 1982, and the format began to be used across the globe. Prior to that, test recordings were completed in 1979 and in 1981, the BBC demonstrated a CD playing the Bee Gees' album, Living Eyes. The first commercial compact disc, a recording of a series of Chopin waltzes performed by pianist Claudio Arrau, was released in 1982. then purchased licenses of the technology in the 1980s. He was the first person to file a patent for a product resembling a combination of laser, digital recording and optical disc technologies in 1966.
James Russell, an American inventor, envisioned an alternative to vinyl albums to store and play audio recordings. As the disc rotates, the laser beam measures differences in the way light is reflected off the polycarbonate layer on the bottom of the disc, converting it to sound.ĬDs are fragile and prone to scratches they can be repaired, but disc readability may be affected. A compact disc is a portable storage medium that can be used to record, store and play back audio, video and other data in digital form.Ī standard compact disc measures 4.7 inches, or 120 millimeters (mm), across, is 1.2 mm thick, weighs between 15 grams and 20 grams, and has a capacity of 80 minutes of audio, or 650 megabytes ( MB) to 700 MB of data.Ī CD works by focusing a 780 nanometer wavelength semiconductor laser onto a single track of the disc.
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