I was goinng thorugh same thing for weeks didnt know what to do so i took it and held it with the slim side and smacked it softly on my nee and it works:D no joke:D try it not tooo hard or else itll brake:)

You already tried the best thing do to identify and diagnose the problem by plugging the device into your computers but doesn't make any sense. This indicates a drive failure and needs to be check physically by a qualified person. I suggest you take your drive to a service center where it can be check and be repaired if possible. You may also contact the store where you bought the drive for any assistance that they can do for you. Check also the warranty of the device. It maybe still under warranty and you can get the replacement for it.

Hope this could help you..:-) Thanks..

Merry Christmas and Advance Happy New Year!!!...