Sony's Blu-ray DVD technology has won over another heavyweight supporter in the battle to be Hollywood's format of choice for the next generation of DVDs.

Film studio Warner Bros has said it will release DVDs in the Blu-ray as well as Toshiba-backed HD DVD formats.

For months, Toshiba and Sony have been leading the charge to woo hi-tech firms and studios to support rival formats.

But the film and technology industries want to avoid a war akin to the 1980s Betamax and VHS video format battle.

Find out more about new backer of the Blu Ray DVD format at http://news.bbc.co.uk/1/hi/business/4362906.stm.