A standard user can mount and unmount drives.
This will be unfortunate for a corporate environment were the computers are locked down, and they are setup so users do not have Admin Access, i hope there is a way around this.
I"m having a similiar but oposit issue. Booting directing into BootCamp works fine. Booting into BootCamp via Parallels ends in a black screen. Doesn't change. It does get by the Windows XP splash screen, then sits at a black screen.
-ric