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    I know this is a pointless question, but I've always wondered why, when you burn data to a CD/DVD, after the burning has taken place, you can see 'shading' on the disc surface where the data has been written?

    Especially given that you don't get this same effect on commercially produced discs.
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    When you burn a disc it changes dye in the disc, I think it has something to do making some pits more or less reflective which the laser can read as a 1 or a 0. Commercial discs don't use dye, I think the pits are pressed into a layer of them.
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    thank you
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    because.... science.
 
 
 
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