What does dual layer mean in terms of DVDs?

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When buying DVD drives or blank DVD media you may have come across a term you didn’t understand the importance of – dual layer. Sometimes also called ‘double layer’, dual layer technology allows for the doubling of the storage capacity on a DVD Disk (from 4.7GB Single Layer to 8.5GB Dual Layer). The technology works with special Dual Layer (DL) media and a DL capable DVD Burner to allow for a second recording layer when writing DVDs. Most modern DVD+R, DVD-R, and DVD+-RW devices have this capability.

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