Toshiba USB hard drive isn't detected

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http://forums.fedoraforum.org – Hello, I am new here, though I have been using fedora linux quite happily for the past 3 months and I am having a problem with one of my external USB hard drives by Toshiba. I tried to encrypt it with LVM and while it was encrypting my desktop suffered a power outage....and now whenever I plug it in nothing happens, and I am always seeing a hard drive mounted that is the same size as the external hard drive in the file manager, regardless of whether it's plugged in or not. I also cannot access this "ghost hard drive" though it "might" be my desktop's hard drive as it is ful (HowTos)