According to an embodiment, a head gimbal assembly includes a support plate, a wiring member, a magnetic head and drive members. The finite state machine frames the serialized virtual GPIO signals into frames each demarcated by a start bit and an end bit. A fabric collar and a pair of zippers not only allow the filter to be readily removed for cleaning, but also allow the air duct system to continue operating with the filter removed. The flexible cables include a first flexible cable connected to the power supply external electrode, and a second flexible cable connected to the counter external electrode. The cover member and the radiation member are made of metal and are formed by press-working. Varying responses may be activated as a result of varying changes in resistance.