HIGH-DENSITY MAGNETO-OPTICAL DISK RECORDING USING MAGNETIC FIELD MODULATION WITH A CAPACITY OF 650 MB/ø64 mm

We have investigated high-density magneto-optical recording on a conventionally structured disk with a diameter of 64 millimeters using magnetic field modulation to achieve a capacity of 650 Mbytes. With the groove conditions optimized, the jitter with cross-talk from adjacent tracks was 7.2% and the recording power margin including overwriting and crosswriting was ±20%. As a result of minimizing cross-talk, a sufficient tilt margin of ±0.82 degree and ±0.63 degree in the radial and tangential direction, respectively, was obtained.