G - Physics – 11 – B
Patent
G - Physics
11
B
352/21.32
G11B 17/02 (2006.01) C25D 3/06 (2006.01) C25D 3/56 (2006.01)
Patent
CA 1072205
DATA STORAGE APPARATUS ABSTRACT Data storage apparatus, as described herein, comprises rotatable storage disks each having a plurality of servo tracks recorded in a servo region on one surface; a servo transducer is moveable by an actuator over the servo tracks under control of signals from an external control unit, and data transducers are ganged for movement to the servo transducer and located over data regions on the disks containing data tracks the position of which are defined by the position of corresponding associated servo tracks. The servo transducer and the actuator form part of a closed loop servo system which derives position error signals from the servo tracks indicative of displacement of the data trans- ducers from data tracks. The position error signals are used during track following phases of the track access operations to cause the closed loop servo system to energize the actuator and move the data transducers in a direction tending to nullify the dis- placement and locate the transducers over a target track. The apparatus further includes a capacitor connectable by means of a switch to function as an integrator in the closed loop servo system. The switch is controlled during an access operation so as to include the integrator in the servo loop at a time to increase the d.c. gain of the loop during the track following phase at the end of the track access operation.
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