I have a Seagate ST3500312CS that can't be detected and making clicking noise. Since it's doesn't hold many important files, I tried open it up and fix it. The head was stuck near the middle motor and after watching a couple of videos and images of hard drive interior, the head should be parked in a slot outside the surface of the disk. But, there's no such thing in my hard drive. Is this normal for my model? Where should I move my head to?