Matsushita Electric Industrial Co and Sony Corp have developed a new technology to store HD content on Secure Disks and Hard drives which will allow a 4 gig SD card to hold 60 minutes of HD video or a 30 gig drive could hold 7 hours of HD video.

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That link has expired here is one that works better:
http://news.stockselector.com/newsarticle.asp?symbol=SNE&article=80792517