Warner Bros. has become the second studio to support both high definition DVD formats, a move that could shift the advantage to the Blu-ray format backed by a group led by Sony Corp.

Warner Bros. Entertainment said Thursday it would join the board of the Blu-ray Disc Association and will release its films on both the Blu-ray and the rival HD DVD format, which is backed by a group led by Toshiba Corp.

Earlier this month, Paramount Pictures, another supporter of HD DVD, said it would release films in both formats.

Find out why Warner Bros decided to back the Blu Ray disc technology at http://www.businessweek.com/ap/financialnews/D8DC5NE00.htm?campaign_id=apn_home_down&chan=db.