Compact disc

A Compact Disc (CD) is a storage device in the form of small plastic compact discs which store and retrieve computer data or music using light. CDs replaced floppy disks and gramophone records because they were faster and could hold more information. The CD was invented by both Philips and Sony at the same time. Sony and Philips did work together to create a standard format and the technology to read a CD in 1982 (JP) and 1983 (outside JP). The CD can store up to 700 MB worth of data, which is about 74-80 minutes of music. The Mini CD has an 8 cm diameter with less music/data storage capacity than the CD of 12 cm. A CD and a Mini CD can have data or music storage capacity. The middle hole in a CD and Mini CD is about 1.5 cm.

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