Blu-ray has got the upper hand on its rival format
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Supermarket giant Wal-Mart, the world's largest retailer, has announced it will only sell high-definition DVDs in the Blu-ray format at its 4,000 US stores.
The decision is viewed as a serious setback for the rival Toshiba-backed HD DVD format.
Wal-Mart said that customers had shown a clear preference for Blu-ray, developed by Sony, and the rival format would be phased out by June.
Wal-Mart follows a similar move by film rental firm Blockbuster.
The better picture quality and bigger capacity of next-generation DVDs and players were expected to help revitalise the $24bn global home DVD market
But, like the Betamax-VHS battle in the 1980s, having two DVD standards has dampened sales of both.
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