Kompaktformat

Kompaktformat, also known as Compact Disc (CD), is a digital optical disc data storage format that was first introduced by Sony and Philips in 1982. It is capable of storing up to 74 minutes of standard audio or 650 megabytes of data. The discs are made of polycarbonate plastic with a thin layer of aluminum to reflect laser light, and a protective coating on top. The data is read using a laser beam that scans the disc's surface.

The standard CD format has a diameter of 120 mm and a thickness of 1.2 mm. It has a spiral track that starts from the center and spirals outward to the edge. The data is encoded in pits and lands on the disc's surface, which are read by the laser beam. The pits are small depressions in the aluminum layer, while the lands are the flat areas between the pits.

CDs are widely used for music storage and playback, as well as for data storage and software distribution. They are also used in various other applications, such as video games, educational materials, and archival storage. The format has been largely replaced by digital downloads and streaming services, but it remains in use for certain applications due to its durability and ease of use.