If you enable the firmware password, it prevents you from booting from a partition/drive that isn't the default startup disk. However, when I boot into mountain lion, The startup disk preference pane isn't locked, despite locking it before rebooting. The default startup disk can simply then be changed. This is even easier with software such as BootChamp installed. If the default startup disk is bootcamp, the system tray bootcamp icon allows the startup disk to be changed without even the option of a lock (regardless of whether that lock would stay locked like in OSX). Am I being stupid or is this a flaw?