Best Buy, the largest US consumer electronics chain, said it will recommend that consumers choose the Sony high-definition video format and will feature Blu-ray hardware and software promotions in all its stores.
"Because we believe that Blu-ray is fast emerging as that single format, we have decided to focus on Blu-ray products," Brian Dunn, Best Buy's president and chief operating officer, said in a statement.
Netflix, which is the country's largest online DVD rental service said it will stock high-def movies exclusively in Blu-ray.
Netflix has been stocking high-definition movies in both formats since early 2006, but said in a statement that all of its new high-definition movie purchases will be Blu-ray and that it will phase out HD DVD discs by the end of the year.