Help! When I turned on my Touch today to listen to my podcasts, it gave the message that there is no music/podcasts on my Touch. I brought it home today to sync it and I get an error message "iTunes cannot read the contents of SSN's iPod". Even when I try to restore my Touch to factory settings I get a message "An unknown error has occurred (-18)". I still have my contact information, Safari settings, and photos all intact - just the music, videos and podcasts are gone. What's going on??