Blu-Ray, the next-generation movie disc format that rivals High-Definition DVD, has another powerful new backer. But does the world need a DVD replacement?

The war over the format for next-generation DVDs has taken another interesting turn, with Warner Brothers defecting from the HD-DVD camp. Well, not quite defecting. More a case of hedging its bets by announcing it'll support both Sony's Blu-Ray format and its previous disc of choice, Toshiba's HD-DVD. Warner's decision follows a similar move by Paramount last month.You see, there's currently a big spat over the future of video discs. Why? Because you can't fit a full movie's worth of high-definition video onto a normal DVD – and the increasing popularity of high-def TVs means that a new disc…

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