There is provided an optical information recording and reproducing system which comprises a light source, a light beam power compensation circuit which can compensate a fluctuation of an emitted light beam power from the light source in response to a detected monitor signal corresponding to a light flux from the light source, a light beam control circuit composed of at least one control loop which controls the light beam emitted from the light source and irradiates the same onto a data storing medium, and a light beam inhibit circuit which can inhibit irradiation of the light beam onto the data storing medium.
Optical information recording reproducing memory system with both power control and optical irradiation inhibiting circuit