Magnetooptic recording readout performance improvement

This paper describes magnetooptical (MO) readout and recording performance improvement that increase the MO disk drive performance. In regard to readout performance, a <60-dB readout carrier-to-noise ratio is achieved for an MO disk with a polycarbonate substrate. Also, in regard to recording performance, a new MO head is presented that achieves high optical transmission efficiency (~57%) without sacrificing the readout performance. As a result, disk rotation speed can be increased, and the data transfer rate can be improved.