That was only for drives with servo-actuated head arms. Think like what the old black-and-white Macs came with. You could tell one of those drives because it so

That was only for drives with servo-actuated head arms. Think like what the old black-and-white Macs came with. You could tell one of those drives because it sounded like somebody revving a cordless screwdriver when it was being accessed. The quiet clicking-type drives use a magnetic voice coil-type actuator, and the loss of power causes them to want to spring back to the park position.