My husband's iPod has only been used on his Power Book, until recently when he plugged it into my Power Book for one transfer. Since then, each time he plugs his iPod into his PB, he gets this message: The info on top is just general info about the iPod. The sentence on top, below, where the button is greyed out, says that only Macintosh-formatted iPods can be updated. Under that, it asks if he wants to build it up again from scratch, with the factory settings. I can't give very specific info, unfortunately. He's not sure himself what he did when, and my questions haven't yielded any specific responses. All I know, is that his iPod has never been used with anything other than two PBs. Anyone know what to do about this? I've told him to hold off downloading any updates until we get some ideas here. So far, he's just closed the window, then proceeded to update his iPod with the most recent content (he has the iPod set to update content manually). So the message doesnt seem to keep him from using his iPod as normal. Obviously, he doesn't want to build it up again with the factory settings.