The present invention discloses a method for controlling in realtime fashion multimedia contents on a second screen at a TX side from a first screen at a RX side. The chelating agent is preferred to be included since it provides added stability and activity to the cleaning composition so that the composition has long term effectiveness. Thereby, even though the dispersion of the recording power becomes large, the erasing power is not greater than a certain range; therefore, the total of the recording power and the erasing power can be restrained and the degradation of the durability, that the optical disc can be repeatedly recorded, can be suppressed. The disk drive base includes an actuator support section that has a seal portion including a seal attachment surface disposed along the outer side. The virtual reality interface creates a user a virtual replica of a physical store.