An information recording andor reproducing apparatus includes a laser light source from which a laser beam having a wavelength of from 220 nm to 280 nm exits; and a converging lens unit disposed at a nearfield area of a recording medium and upon which the laser beam from the laser light source is incident. The device features a clearance member in the form of a loop. The spindle has a tapered raceway forming a cone of the outboard bearing member, the raceway lying inboard of the flange. The piston is adapted to move between a first position and a second position where the piston selectively engages an engine valve. Note that the scenario section of the graphical user interface is useful for a novice user who does not understand the interrelationships between routing parameters, while the parameter section of the graphical user interface is useful for an advanced user who desires to set individual parameters. The system includes a switching arrangement that allows an operator to manually connect the auxiliary power source with other circuits that are not generally powered during disruption of the primary power source.