A system includes a first storage unit connected to a secondary storage unit such that data written to the first storage unit is replicated on the secondary storage unit. The vibration damping device includes a rotary member that is rotated by a torque, and an inertial mass that is oscillated by torque pulses. A cover member of insulating material hermetically seals over the cavity. The light transmission region and the light shielding region of the active barrier can be formed by means of the oxidation reaction and the reduction reaction of the electrochromism layer, achieving the bare eye mode of 3D display and the switching mode between 2D display and 3D display.