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How a cd drive works

I want to know how a cd drive read a cd

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A intense laser burns "micro-holes" in the film to represent the data...

A low intensity laser reads the spaces the high intensity laser left behind because the film casts back a reflection

DVD's work very similar; one low intensity layer and one high intensity layer. Furthermore, the laser makes much better use of the surface space so the DVD can hold more data

Posted on Nov 28, 2008

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