Upon transmission of a first torque from a first brake portion to a first eccentric shaft, the first eccentric shaft rotates in a retarding direction relative to a rotating member. The fail-safe apparatus includes fail-safe circuitry for controlling the operation of the first and second solenoid-controlled valves between unactuated and actuated states. The method determines whether the press operation is within a press area of the unlocking interface. A pair of resilient barbs extends inwards from an end portion of each side plate. The data storage consumers will have the opportunity to define storage parameters for each of the data defined in the logical representation. The cover member is movable between an opening posture for exposing a first side of the corresponding cartridge accommodating section in the first direction and a closing posture for opposing the first side of the corresponding cartridge accommodating section.