Rubyrails:
Thanks for the advice, Paul. Do you know anything about how I should add it to switch the voltage? Would it be on the breadboard to be connected to the Arduino and then passed to the disc?
Is it a "relay" or is a relay module/circuit board with a LED, optio-isolator and several places to connect wires?
Use a breadboard to make a prototype system. The low 12 volt current of the disc means it, too can be connected through the breadboard.
Paul