compact disc![click to hear](/images/speaker.jpg)
Digital recording medium with multiple formats (including video and audio) and variable storage capacity.
reading start ![click to hear](/images/speaker.jpg)
The track on the pressed surface is made up of a series of pits and asperities; a laser beam reads the groove from the inside out.
pressed area ![click to hear](/images/speaker.jpg)
Surface that contains the recording; it is coded on a spiral groove pressed into the disc.
technical identification band ![click to hear](/images/speaker.jpg)
Surface on which the disc’s identification code is engraved.