Servo and data channels for high performance magneto-optical disk drive

Servo and read-write techniques which were used to achieve 35-ms access time and 13-Mb/sec data transfer rate in a 1-GByte erasable optical disk system are described. Servo techniques include methods for seeking directly to a desired track without any need for a corrective seek. In addition, an electrical method of eliminating the effect of groove crosstalk into the focus error signal while seeking is described. In the data channel area a peak-detector-type channel with cosine equalization operates over a range of data rates from 6.8 to 13.1 Mb/sec with input resolution as low as 45%. Automatic write power compensation and temperature compensation are used to control resolution over a wide range of media sensitivities.<>