This has been doing my box in for ages. I have 2 user accounts set up in OSX one for me and one for my bro. I have an iPod nano which is solely used by me. It sits in its dock until I need it. Whenever I open iTunes the iPod erases itself then reloads all my music again because when my brother opens iTunes with his OSX user account it wipes all my music off and puts his crap on there. If while in my bros iTunes I tell the iPod not to autosync. It affects my account too. So i will go baack to my account, open up iTunes and it will be set to 'not auto sync'. How the hell can I stop my brothers music being copied onto my iPod while keeping my music on it with two user accounts? I may send feedback to Apple about 'locking' an iPod to a specific user account. It seems stupid that this happens. Anyone have any ideas?