Blu-ray and HD DVD are new formats of optical media similar to DVD. The difference is that they both use a special blue laser to store anywhere from 3 to nearly 10 times more information on the disc.
Even though both formats use a blue laser to read and write to the discs, they both utilize a different strategy to do so. The HD DVD format can currently hold 15GB on a single layer disc and 30GB on a double layer disc while the Blu-ray format can currently hold 25GB on a single layer disc and 50GB on a double layer disc.
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