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Method and apparatus reducing off track head motion due to disk vibration in a hard disk drive using configuration of the disk drive servo controller

  • US 6,958,879 B2
  • Filed: 07/10/2003
  • Issued: 10/25/2005
  • Est. Priority Date: 07/10/2003
  • Status: Expired due to Fees
First Claim
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1. A mechanism controlling a voice coil, comprising:

  • means for reducing a gain of a PES within a disk vibration frequency range;

    wherein said disk vibration frequency range includes frequencies between at least 1000 Herz and at most 3000 Herz; and

    means for increasing said gain of said PES within a lower frequency range;

    wherein said lower frequency range includes frequencies between at least 16 Herz and at most 800 Herz;

    wherein said voice coil drives an actuator arm positioning a head gimbal assembly for a read-write head communicatively accessing a track on a rotating disk surface to generate said PES;

    wherein said PES is a function of said head gimbal assembly responding to mechanical vibrations in said rotating disk surface by providing said read-write head with radial motion toward said track;

    wherein said head gimbal assembly, comprises;

    means for moving said slider parallel to said disk surface toward said track, when said disk surface is flat, by an actuator arm moving said slider by a lever action through a principal axis with said slider aligned at a bias angle;

    means for radially moving said slider toward said track when said disk surface is bent, by said lever action through said principal axis at said bias angle causing said slider to move radially toward said track, when said disk surface is bent.

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