Dual Layer DVD: These DVDs have two differently permeable layers (=Layer) in which information is stored. There DVD-Player If you have a laser scanner that can usually be focused on two levels, it can process both layers one after the other. It starts on the inside and spirals outward. When he gets there, he adjusts his focus (this usually leads to small interruptions in the film in the form of a still image) and works through the second layer. This has the advantage that the capacity of the DVD is doubled.
