Double-density compact disc

The double-density compact disc (DDCD) is an optical disc technology developed by Sony and Philips using the same 780 nm laser wavelength as a compact disc. The format was announced in July 2000 and is defined by the Purple Book standard document.

Source: Wikipedia — Double-density compact disc (CC BY-SA 4.0)

Double-density compact disc

The double-density compact disc (DDCD) is an optical disc technology developed by Sony and Philips using the same 780 nm laser wavelength as a compact disc. The format was announced in July 2000 and is defined by the Purple Book standard document.

Source: Wikipedia "Double-density compact disc" · CC BY-SA 4.0

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