I'm helping a friend of mine who is having issues with his iPod. His iPod is a 6th generation iPod classic (80 GB). The first issue is that the iPod will not show up in iTunes. When it is plugged in, iTunes freezes up, both on Mac and Windows, on multiple machines. The second issue is that his iPod has 22 GB of "Other" space being used, that is music, however, under the Music menu, it says that there is no music. The third issue is that it is impossible to restore the iPod because it causes iTunes to freeze. What can I do to restore the iPod?