Appeal No. 95-3570
Application 08/215,192
The invention relates to “a method for compensating for
variations in the torque constant of a voice coil driven actuator
for moving the read/write heads in a hard disc drive data storage
device” (specification, page 1). Claim 5 is illustrative and
reads as follows:
5. A method for compensating for variations in
acceleration and deceleration capability of a voice coil actuator
motor, having a nominal torque capability, in a disc drive in
which discs are rotated for data transfer at track locations
thereon responsive to positioning of read/write heads supported
by the voice coil actuator motor, the method comprising the steps
of:
dividing the discs radially into a plurality of zones;
determining the actual torque capability of the voice coil
actuator motor in each zone;
determining a zone compensation factor for each zone from
the actual torque capability of the voice coil actuator motor and
the nominal torque capability for the voice coil actuator motor;
and
thereafter, during track following operations in a selected
zone, driving the voice coil actuator motor in proportion to the
zone compensation factor for the selected zone.
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