When you watch a long DVD movie, you may notice a hiccup two-thirds of the way through, when the DVD player's laser jumps from the first layer of the disc's data to the second. Most DVD videos are one-sided, two-layer discs that can store the film plus extras and cinematic audio, but DVD burners for computer or home theater have until now recorded only onto single-layer discs. Sony is first with a two-layer burner, the $199 DRU-700A for Windows PCs, while Iomega and Dell are about to introduce products with double-layer DVD burning. Since a one-layer disc generally fits less...
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