I used migration assistant to move users and programs to my new mac pro from my old one. Everything seemed fine until I tried to use handbrake to copy my dvd for use with my Apple TV. I have a dedicated drive for my movies called itunes to where The dvd being converted copies there. It wouldn't let me. I looked at the permissions and low and behold its locked. Whats weird is there is a user listed as unknown that has read access. I cannot delete this user. Any ideas as to how or why this is there? How can I remove this user?