Browse Prior Art Database

New Integrator Update Method

IP.com Disclosure Number: IPCOM000118385D
Original Publication Date: 1997-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Ozawa, Y: AUTHOR [+2]

Abstract

Disclosed is a new integrator table method for a hard disk drive using a head, disk, Voice Coil Motor (VCM) actuator and flexible cable which is wiring from an Arm Electric (AE) circuit and a read/write head on a VCM actuator assembly.

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New Integrator Update Method

      Disclosed is a new integrator table method for a hard disk
drive using a head, disk, Voice Coil Motor (VCM) actuator and
flexible cable which is wiring from an Arm Electric (AE) circuit and
a read/write head on a VCM actuator assembly.

      An integrator table is used at the seek operation.  Integrator
value is a function of the position (cylinder number) because of the
bias force of the flexible and helps seek settling time.  This means
that the proper table update method improves seek settling time.

The merits of this method are as follows:
  1.  Update nearest table value on its boundary (band).
  2.  Use proper influence function which relies on the distance
       between boundary point and current cylinder position.

      Assume integrator value at the position boundary P (P exists
every 256 tracks), current position x is in between P and P+1.  If
the boundary position P is closer than P+1 from the current position
x, only  Integ(P) is updated (above item-1).

      When updated here, multiply some proper influence function
(in this case, first linear function) f(x) (above item-2).
    Thus,
  Next Integ(P) = Previous Integ(P) + delta/2 * f(x) ....(1)
           delta = A - B                         ....(2)
           where  A = current integ value at the position x
       B = linear approximation integrator value of Integ(P) and
        ...