If that fails also, mount the disk in another enclosure and try again.
If even that fails, it's time to start thinking about data recovery.
There are some DIY programs (like mentioned by Bob in http://forums.cnet.com/5208-7591_102-0.html?forumID=26&threadID=258797&messageID=2553632#2553632) or you can find a professional company to do it.
Hope this helps.
I am trying to retrieve files from a Maxtor One Touch III USB drive. My computer recognizes the machine but it doesn't autorun and it doesnt appear in My Computer. How do I access the files?