I have an Ipod Classic 160G that I just bought. I uploaded my itunes library to it but for whatever reason it did not work. I then restored it to factory to delete these songs and retried. The new songs worked but now it shows that twice the memory is being used. I've tried restoring again and it still brings me back to 12G is being used but nothing is on it, so it says. How do I get these off/get back to the 160G?