PURPOSE: To prevent the generation of a transitional phenomenon when the reproduction of an optical magnetic area is started and to accurately reproduce recorded data by recording a pseudo optical magnetic signal having a pattern similar to user information on an identification area.
CONSTITUTION: A pseudo optical magnetic signal from an optical magnetic signal pattern generation circuit 44 is taken out of an AND circuit 43 while scanning an ID area and supplied to a driving circuit 45. Thus, when information about an optical magnetic disk 15 recording the pseudo optical magnetic signal once on ID area is recorded and then reproduced, the transitional phenomenon is generated when the reproduction of the ID area is started. But since the pseudo optical magnetic signal is recorded on the ID area, the generation of the transitional phenomenon is prevented at the time of starting the reproduction of an MO area, a reproducing signal without a fluctuation at a DC level is gained, this reproducing signal is easily transformed into a pulse by slicing it at a reference level and thus, the recorded data is reproduced.
IZUMI HARUHIKO
TAGUCHI MASAKAZU
