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Disk drive head retract and motor braking method and apparatus

  • US 4,831,469 A
  • Filed: 07/29/1987
  • Issued: 05/16/1989
  • Est. Priority Date: 07/29/1987
  • Status: Expired due to Term
First Claim
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1. A method of retracting a head assembly of a disk drive and of braking a multi-phase spindle motor of said disk drive upon loss of power to said disk drive, comprising the steps of:

  • detecting the loss of power to said disk drive;

    generating power with one phase of said multi-phase spindle motor to retract said head assembly; and

    simultaneously shorting the remaining phases of said multi-phase motor to regeneratively brake said multi-phase motor.

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