With the battle for the successor format to the wildly successful DVD continuing, restless consumers are scooping up DVDs, liquidated VHS tapes, and the new, small Universal Media Disc (UMD) format for Sony's PlayStation Portable game device. Although Sony-backed Blu-ray technology seems to be outpacing Toshiba-backed HD DVD in the ongoing high-definition DVD format war, retailers need to be increasingly aware of the PlayStation Portable movie format - UMD, also known as PSP, released in ...

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