Disclosed is an optical disc apparatus that sets a plurality of virtual zones, which correspond to a plurality of zones that are arranged in the radial direction of an optical disc, for a plurality of recording layers of the optical disc. The security system comprises a portable transmitter and a mounted receiver. The apparatus can be free standing, fixed to the walls or ceiling, or attached to an object on which an individual is resting or exercising. Methods of use are further described. The first ferromagnetic film contains cobalt, iron, and boron.