So, I took a old (broken) Hardisk I had lying arround.
Removed the print on the backside.
Disassembled a bit more and followd the how-to of the
Hackedgadgets website. (They really made it easy for me) To move the arm I had to find the + and - of the voice coil. Because the most current will flow thrue there it will most likely be the thickest layers.
I only had 4, and 1 of it wasn't connected on the print. So a little bit messuring if it was the one I need, and voila. Found it.
Soldering a cable on the found points and removing the layers to the rest of the print with a little knife.
Hooking up a old amp to test it. The arm went back and forward so that should work.
Little bit of plundering my mothers old broken mirror tray. And with a some wire and hot glue connecting it to the harddrive. Powering the laser and aiming everything so we can see it on the wall.
And eureka! It works!
Because it is very difficult to see it on a picture, here's a movie:
