IIRC, there's a few screws around the perimeter of the body you have to remove, and then there's two screws that attach a plastic block that prevents you from removing the drawer from the body. Once you get it apart the disk is held down by a metal strap; you unscrew it, take the disk out, and then put everything back together in reverse order.
I have now managed to remove it. Wow, Apug rocks, it took me only a few minutes to get useful responses. Thanks a lot!