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What are dual layer DVDs?
Early DVD discs only had one layer. This meant not as much video could be stored on them. Longer movies meant either using two discs or a double-sided DVD (such as with the original release of "A Time to Kill").

Dual layer DVDs offer about twice as much space, so even very long movies fit on one side of a single disc.

Normally, a DVD is read from the inside to the outside and that's the end (similar to CDs). With a dual layer disc, once the laser reaches the outside edge, it refocuses and travels back toward the center on the second layer.

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