Patent ID: 7113453

Claim:
A method for recording and reproduction on a magneto-optical recording medium including at least first and second magnetic layers, in which multi-valued information is recorded on the magneto-optical recording medium as a combination of magnetization states of the respective magnetic layers, and the multi-valued information is reproduced on the basis of an aggregate of the magnetization states of the respective magnetic layers, comprising: irradiating the magnetic layers with a light beam having wave length λ 1 to reproduce first information recorded on the first magnetic layer; storing the first information reproduced from the first magnetic layer; and irradiating the magnetic layers with a light beam having wavelength λ 2 (λ 2 ≠λ 1 ) to heat to a recording temperature of the magnetic layers while applying a magnetic field in accordance with a combination of the stored, first information and second information to be recorded on the second magnetic layer, so that the first information is re-recorded on to the first magnetic layer and the second information is recorded onto the second magnetic layer.