Research firm Home Media Research has revealed that Blu-ray high definition movie discs alone outsold films on the HD-DVD format by 2-to-1 during the first half of the year 2007 in the United States. The Blu-ray format recieved a creditable boost from the movie '300' selling 190,000 units of the film in comparison to the 97,000 sold on HD-DVD since July 31.

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Blu-ray high-definition movie discs outsold films on the rival HD-DVD format by 2-to-1 in the United States in the first half of 2007, Home Media Research said on Tuesday.

The division of Home Media Magazine said total sales of Blu-ray discs, using a Sony Corp - backed technology, totaled 1.6 million units from January 1 through July 1, compared with 795,000 HD-DVD discs sold in that period.

HD-DVD was developed by Toshiba Corp and backed by Microsoft Corp and film studios such as Warner Bros.

Both formats were launched in spring of 2006. An estimated 3.7 million high-definition discs have been sold, including 2.2 million in Blu-ray and 1.5 million in HD-DVD through the end of July, according to Home Media.