Thread: Help needed
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Old 08-06-2009   #5
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Blu-Ray is based off a different type of laser than DVD so two lasers are required to be able to have backwards compatibility with DVD's and CD's. More specifically a DVD drive uses a 650 nanometre red laser where Blu-Ray requires a 405 nm blue-violet laser, hence the need for two different lasers. See Wikipedia's article on Blu-Ray for more info.

http://en.wikipedia.org/wiki/Blu-Ray
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