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Technology

DVD 5 vs DVD9

The functioning of a DVD is described here, as well as the difference between the DVD 5 and DVD 9.

DVD 5	DVD 9
One information layer.	Two information layers.
Only one reflection layer	A semi-reflection layer (layer 0), and a reflection layer (layer 1).
Intermediate layer made up of a bonding material that sticks the two disc halves together.	Intermediate layer made up by a bonding material that sticks the two disc halves together.

 
 The density of information of the DVD 9 is different to that of the DVD 5 although the track pitch is the same in both cases.

DVD 5 reading
The DVD 5 can only be read from the inside to the outside of the disc.

DVD 9 Reading
The DVD 9 can be read in two ways, reading of Layer 0 from the inside to the outside and reading of Layer 1 from the outside to the inside (opposite tracks) or reading of layer 0 from the inside to the outside of the disc, and reading of Layer 1 in the same direction (parallel tracks). This type of option will depend on the  Authoring and the customer preferences.