An information recording/reproducing apparatus for recording and
reproducing information to and from a magneto-optical storage medium that
includes a first magnetic layer for recording at least information, a
second magnetic layer for regulating a switched connective force, and a
third magnetic layer for shifting a magnetic wall of recorded markings
for information reproduction. The three layers being stacked on a
transparent substrate to make up the storage medium. The information
recording/reproducing apparatus includes an optical head and a magnetic
head. The optical head has a light source and an objective lens, the
light source is configured to emit at least a laser beam with a
wavelength of about 780 nm, the objective lens having a numerical
aperture of about 0.45 and is configured to focus the laser beam from the
light source into a beam spot for emission onto the magneto-optical
storage medium. The magnetic head is for applying a recording magnetic
field to the magneto-optical storage medium.