Dual Layer Technology, or Double 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.
Why this is useful comes in the data storage & reading capabilities of a DVD drive. In a lot of cases a single standard DVD simply doesn’t have enough space on it to store a large movie, data files, or whatever else you’re trying to put on there. A Dual Layer disc can store roughly two times the amount of data that a standard one can.
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