The system and method to advance human performance in sighting, tracking, recognizing, and reacting to moving and stationary objects, for example, advancing skill in engaging targets with a firearm. The optical disc drive is configured to output an eject signal to an outside in response to an operation of an eject button. The height of the magnetic shields in a direction perpendicular to the air bearing surface is less than the distance from the air bearing surface to the MR element, and the lengthwise direction of the magnetic shields is in parallel to the air bearing surface in the vicinity of the position in which the flux guide is formed. The end wall portions have inner surfaces of constant or smaller varying radii of curvature and they are separated from the interior ends of the electrodes by more than one millimeter. The present invention also relates to a topical composition for treating a herpes virus infection selected from the group consisting of an HSV infection, a cytomegalovirus infection, and a varicella zoster virus infection.