Feature Suggestion: automount/unmount

[Bagelturf]

With a firewire disk attached all the time mount before back up and unmount after is a huge help. I run a scheduled smart backup early in the morning so that by the time I need the computer it is done. But to do that I have to leave the FW drive on and mounted. Leaving it on is fine, but I don't want to have it mounted all the time:

1) Drive spin ups on dialogs
2) Can get written on
3) Might confuse anyone who is using the machine (icon is the same as the original)
4) Don't want to accidently run any apps on it or save anything to it