There is somthing wrong with my Ipod.It is recognized as disk F:

Ok well I just bought an ipod off of a friend and when I went home I plugged it in. It is an ipod classic 5th gen with 80 GB. When I plugged it in It said "you have to format disk F before you can use it. So I clicked ok and it said windows cannot format disk. My Ipod doesnt sshow up on ituneS but itunes opens when I plug it in. And whenever I play A game on the ipod it freezes and then resets itself to where I have to choose a language. It says 0kb free on it even though there are no songs or anything on it. Please help Me guys. PLEASE