Your problem could be any one of these issues:
1. Faulty USB port on PC: Try a different computer or laptop
2. Faulty USB cable: Try a different Cable
3. Corrupt memory: Software Fix by an expert required such as www.SaveMyUSB.com
4. Faulty connections on main circuit inside the hard drive: Physical Fix by an expert required such as www.SaveMyUSB.com
5. Faulty controller chip (worst case scenario) : Direct flash memory read required by an expert required such as www.SaveMyUSB.com
Hope this helps and that it is 1 or 2 as 3, 4 and 5 will cost you money.
Good luck!
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