Ford 6006e security code needed?

I have a focus with a 6006e head unit, can't find the code for the stereo anywhere with the paper work that came with the car, i was wondering does anybody know how to view the currnet code, so i can re enter when i come to refit it??????

I still have it fitted at the moment, but need to remove it cos i loaded a cd, and it now says that the slot is empty and think that all 6 slots have disks in, when it really has 7??????eaten on of my disk......