Title :
Servo and data channels for high performance magneto-optical disk drive
Author :
Johann, Don ; Burroughs, Alan
Author_Institution :
Maxoptix Corp., San Jose, CA, USA
fDate :
11/1/1991 12:00:00 AM
Abstract :
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
Keywords :
adaptive control; compensation; equalisers; magneto-optical recording; position control; servomechanisms; 1 Gbyte; 13 Mbit/s; 35 ms; access time; automatic write power compensation; cosine equalization; data channels; data transfer rate; erasable optical disk system; focus error signal; groove crosstalk; magneto-optical disk drive; peak-detector-type channel; read-write techniques; resolution control; seeking; temperature compensation; tracking; Diffraction; Disk drives; Focusing; High speed optical techniques; Magnetooptic effects; Optical crosstalk; Optical feedback; Optical sensors; Sensor arrays; Servomechanisms;
Journal_Title :
Magnetics, IEEE Transactions on
