receiving an input signal higher than or lower than a predetermined input level this limiter circuit 10 sets the upper limit value and the lower limit value for the reproduction signal also the pr equalizing circuit 11 is a circuit that performs waveform equalization of the reproduction signal that is performs equalization to a pr 1 u2212 1 characteristic to do so the pr equalizing circuit 11 mainly includes a low pass filter a differentiating circuit and a transversal filter those construction elements of the pr equalizing circuit 11 are well known so that the detailed description thereof will be omitted the fundamental recording operation according to this embodiment is the same as that shown in fig7 a to 7e in brief at the time of recording of the recording signal of in fig7 a a light beam set at the predetermined recording power as shown in fig7 b and modulated in a pulse manner is applied to the magneto optical disk 1 from the optical head 5 and simultaneously the modulation magnetic field as shown in fig7 c based on the recording signal of fig7 a is applied to a light beam irradiation region from the magnetic head 9 in this embodiment the bottom power.