Let me preface this by saying I am only trying to disguise the fact that I like playing portable Diablo II at work (not online tho)

If I encrypt a USB drive can it be accessed by a network audit? I don't know if that's enough information to go on but, knowing they won't try to bypass encryption or the like, I'm wondering if it's safe to assume that since we're not allowed to store files on our PC's, in the event of an audit would this be a route to go?
Perhaps there is a way to hide or mask a drive instead of encrypting it? I may partition the drive and create a dummy drive that has nothing on it, and the real one would be encrypted. I don't really care if they see a drive connected and they try and access it and they can't, but I'd rather nobody know.

Thanks as always!