Step 3: Play Music
It will only work if the thing is resting ontop of a good sounding surface, if you're holding it in your hand it won't work. This is like how the strings of a guitar won't make much sound without the big flat guitar beneath them.
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Depending on your hard drive and the number of platters it has, your arm will have no less than 4 pins, 2 for the coil, and 1 for each side of each platter it writes on.
All you have to do is look at the pins on the arm, and follow the leads coming off of them to determine which is connected where. The rest is simple.