Patent ID: 7110328

Claim:
An information recording/reproducing apparatus for recording and reproducing information, comprising: an optical head having a light source and an objective lens, said light source configured to emit at least a laser beam with a wavelength of about 780 nm, the objective lens has a numerical aperture of about 0.45 and is configured to focus the laser beam from said light source into a beam spot for emission onto at least a first or second magneto-optical storage medium; and a magnetic head configured to apply a recording magnetic field to at least the first type or second type magneto-optical storage medium having the same diameter, said first type magneto-optical storage medium including 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, and said second type magneto-optical storage medium including a first dielectric film, a magnetic film, a second dielectric film, a reflective film, and a protective film stacked on a transparent polycarbonate substrate.