Install HD Sentinal and see how healthy it is, if it's not healthy do a search for ESTools, burn it to a disc and boot to it, do a low level format and then see what HD Sentinal says then, either way the way it is now it's no good to you currently, so a clean off should be a consideration especially if sentinal says the drive is healthy, hth.
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DOING ANYTHING I HAVE SUGGESTED IS AT YOUR OWN RISK, NEITHER I NOR SEAGATE TAKE ANY RESPONSIBILITY, IT'S YOUR CHOICE TO DO WHAT YOU FEEL IS BEST FOR YOU
