In the year and a half that I have owned my ipad, I have needed to 'restore' it a few times. And every time I do it, it checks to see if the software is up to date. It is always running the latest version, but yet itunes always insists on spending an _hour and a half_ downloading the same software that is already on the ipad and "updating" it before it restores. Every. Time. Why is this?