I own two Ipod Classics, 120Gb and 180Gb, which I have previously used via ITunes on a Windows system. I recently purchased an Apple computer and got it authenticated for ITunes. Whilst I can sync music and photos onto one Ipod via the Apple computer it only partially recognises the second Ipod, no Ipod symbol appears after connection but I get a message about incorrect disconnection when I disconnect. I have also had a message that Apple cannot repair my Ipod (albeit that it recognises its name) and a message to reformat the Ipod. How do I do this if I can't get into the system?