How data is stored on a dual layer DVD?

[prateekgoel123]

What is way of management of data on the layers in a dual layer DVD?
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What is the maximum DVD size available in market?

[drgrudge]

In dual layer DVD's, are 2 layers of writing...
1st layer: just after the protection layer
2nd layer: .02 mm after first layer. As shown i figure:


The dual layer DVD burner's have two burning Wavelenths..., the larger one to penetrate and write into the second layer.

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Maximum DVD size: 54Gb, but that wont be available in India, in chennai i have not even seen a DVD more than 8.5gb , that too costed a cool 550 rs.