Importance

Loading Importance Indicators...

Abstract

The invention relates to a disk drive and related method for improved disk rotation rate control in the presence of seek operations. A spindle motor rotates a spindle, supporting at least one disk with a magnetic recording surface, in response to a motor current. The actuator radially positions a transducer head over the recording surface. The motor is subjected to a torque load component related to the transducer head radial position. The spindle motor controller has a feedback control loop and a feedforward control element. The feedback control loop maintains a relatively constant spindle rotation rate based on a difference error between a predetermined target spindle rotation rate parameter and a measured spindle rotation rate parameter. The feedforward control element, in conjunction with a seek operation, adjusts the motor current based on a target head radial position with respect to an initial head radial position.

Loading the Abstract Image...

First Claim