| abstract |
An optical disc system includes a focusing mechanism and a tracking mechanism, the mechanisms being controlled by a feedback loop. The system may also include a magnetomotive field generator for subjecting a magneto-optical storage medium to a magnetic field. The magnetomotive field generator comprises a bias coil (122) and a bias coil driver, switchably connected to the bias coil for supplying an electric current thereto. A current monitoring circuit connected to the bias coil driver supplies an output reponsive to the drive current to a processor. The processor ensures that the bias current is at a desired level when writing is attempted. The optical disc system may also include an improved focus capture system. |