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Disturbance rejection of mechanical interaction for dual-actuator disc drives using adaptive feedforward servo

  • US 6,493,172 B1
  • Filed: 07/21/2000
  • Issued: 12/10/2002
  • Est. Priority Date: 07/23/1999
  • Status: Expired due to Term
First Claim
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1. In a disc drive having at least two actuator assemblies, each adapted to operate in a servo loop to position a read/write head relative to a disc surface, each servo loop adapted to provide a servo control signal to its associated actuator assembly based on a position error signal indicative of a difference between an actual position of the read/write head relative to the disc surface and a desired position of the read/write head, a method of attenuating a disturbance to the positioning of a first read/write head, associated with a first actuator assembly, caused by motion of a second actuator assembly, the method comprising steps of:

  • (a) providing the servo control signal provided to the second actuator assembly to a first adaptive filter adapted to produce a feedforward signal adapted to offset the disturbance to the positioning of the first read/write head caused by motion of the second actuator assembly, the first adaptive filter having parameters that are adjustable based upon the received servo control signal and the position error signal of the first actuator assembly; and

    (b) providing the feedforward signal to the servo loop of the first actuator assembly.

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