U3 bypasses disabled Autorun
I found the hard way that SanDisks U3 writes a segment to appear to be another CD player, and all Windows before Vista install it as such with Autorun Enabled BY DEFAULT, so that crap U3 is then installed and changes your disk assignments while it hunts for stuff to put on your SanDisk web account! There a lot of old sticks out there with the shit still on them, but I remove them from service with a hammer when I find them. And if your data disappears, tough tittie.