Ok, yesterday I wanted to update my iPod so I plugged it in and I got an error message about my USB malfunctioning and then my ipod was frozen on "do not disconnect". I unfroze it and tried again. Same thing. Then I changed ports and same problem. I kept unfreezing and got rid of the songs I added thinking they might be messing it up. I plugged it in and I thought it was fine. When I checked it the next day when I wanted to use it all my songs were gone. I plugged it back in, restored the iPod settings and it still doesn't recognize it. Its telling me "iTunes cannot read the contents of the iPod '__ iPod'. Go to the summary tab in iPod preferences to restore settings it the factory settings." It won't let me restore, though because of an unknown error. What is the problem and how do I fix it?