A webpage for a GPS device enables sending information automatically to the GPS device. A cylindrical electrode is mounted on the electrode roll to come into contact with an outer peripheral surface of the electrode roll. Such an optical via may be made of a material that has an index of refraction that is conducive to optically coupling between the light guides. Then, an external magnetic field from the magnetic head is applied onto the magneto-optical disk as applying a laser beam of a reproduction level onto the magneto-optical disk. Each of the core dies may be configured to output a strobe signal in response to a read command, and the base die may be configured to make remaining data output times correspond to any one data output time among respective data output times of the plurality of core dies, in response to the read command and the strobe signal.