external hd won't shut down . says logic is still open

[Philipjent]

For some reason when I a make a song in midi, and I save it, I shut down Logic and then try to shut down my external HD. But when I try and shut down the external drive it says that Logic is still running, and I cant shut it down. Now Logic is clearly shut down but still when I try and shut down the external drive it says Logic is not shut down. Please help!!!!!!!!!!!