Similar to the Beta vs. VHS battles of the '80s, Blu-Ray and HD-DVD clashed over which technology would secede DVD as the standard home video format. Urban legend has it that VHS beat Betamax because of support from the porn industry. If that's the case, Blu-Ray probably won out because of PS3. Either way, Sony's disc outsold its competitor two to one and the format wars were over by early 2008.