bicameral

I have a free usb drive with a corporate promo on it, its partitioned U3 style with a read-only cdfs and a usb partition. But U3 customizer doesn't work on it and it has no U3 files on the cd, just the promo movie and autorun.inf The drive is a cyberkey SM_USB20. I tried the official utility to repartition but it won't, write protected. Any advice on replacing the cd contents or reformatting the entire drive? Thanks.