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DualDisc
Unlike regular CDs, DualDiscs are double-sided. One side contains standard CD audio; the other features DVD content, often including the album in higher-fidelity stereo or a 5.1-channel surround sound mix; lyrics, photos, and computer files; music videos, interviews, and documentaries; and anything else one might find on a regular DVD. Though DualDiscs are slightly thicker than ordinary discs, the DVD side should play in all DVD players, and the CD side should play in all CD players.
Gold CD
In place of the aluminum commonly used on regular CDs, gold is sometimes used, providing greater longevity. Gold CDs can be played in any CD player.
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