[ubuntu] External HD unrecognized

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http://ubuntuforums.org – Hello, I recently converted to Ubuntu after my XP install had a mega failure. It's all going grand apart from one thing, my external hard drive became 'unrecognized' after I tried to sync the music on it to Rhythmbox. I think I either 'force quit' Rhythmbox or 'force quit' the hard disk folder. The HD is fine as it reads perfectly on my Asus eee - so I guess the problem is somewhere on this system? Thanks in advance for any help.:) (Hardware)