blu-ray and hd dvd formats have now been at war for about a year and half. many have compared the latest formats war to one we saw just a few decades ago, vhs vs betamax. so sony (main backer of blu-ray, prev of betamax) is no stranger in a format war, in actuality they really have been big backers/creators of other formats that succeeded (ms duo) and also failed (minidisc, umd??). while toshiba (main backer of hd dvd) is somewhat new in this regard but has some big backers such as microsoft and intel. (wiki pages for bluray and hd dvd ).
the two formats are not compatible with each other and each has different storage capacities. hd dvd offers single and dual layer disks w/max capacities of 15gb/30gb while blu ray offers 25gb/50gb. both offer a similar encryption system to twarth unauthorized copying (usually requires using an hdcp hdmi connection).
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