Patents by Inventor Peter Kui Ho

Peter Kui Ho has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for providing a marker for adaptive formatting via a self-servowrite process
    Patent number: 7079347
    Abstract: A method and apparatus for providing a marker at the end of the adaptive self-servowrite process for adaptive formatting via the self-servowrite process. The mark is used later in the drive manufacturing process to identify the number of tracks written on the surface and thus determine the appropriate format to use in the drive.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: July 18, 2006
    Assignee: International Business Machines Corporation
    Inventors: Paul M. Cisewski, Blake Finstad, Peter Kui Ho, Kishan Kumar Kumbla, Daniel J. Malone, Scott Arthur Thomas
  • Method, system, and program for estimating coil resistance of a voice coil motor in a disk drive system
    Patent number: 6873489
    Abstract: Provided are a method, system, and program for estimating coil resistance of a voice coil motor for an actuator assembly in a disk drive system. An estimation is made of a calibration coil resistance during a calibration operation. A determination is made of a distance moved during a seek operation. The determined distance and the calibration coil resistance are used to estimate a current coil resistance following the seek operation.
    Type: Grant
    Filed: March 25, 2002
    Date of Patent: March 29, 2005
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Peter Kui Ho, Mantle Man-Hon Yu
  • Method and apparatus for providing a marker for adaptive formatting via a self-servowrite process
    Publication number: 20040085669
    Abstract: A method and apparatus for providing a marker at the end of the adaptive self-servowrite process for adaptive formatting via the self-servowrite process. The mark is used later in the drive manufacturing process to identify the number of tracks written on the surface and thus determine the appropriate format to use in the drive.
    Type: Application
    Filed: November 6, 2002
    Publication date: May 6, 2004
    Applicant: International Business Machines Corporation
    Inventors: Paul M. Cisewski, Blake Finstad, Peter Kui Ho, Kishan Kumar Kumbla, Daniel J. Malone, Scott Arthur Thomas
  • Method, system, and program for estimating coil resistance of a voice coil motor in a disk drive system
    Publication number: 20030179486
    Abstract: Provided are a method, system, and program for estimating coil resistance of a voice coil motor for an actuator assembly in a disk drive system. An estimation is made of a calibration coil resistance during a calibration operation. A determination is made of a distance moved during a seek operation. The determined distance and the calibration coil resistance are used to estimate a current coil resistance following the seek operation.
    Type: Application
    Filed: March 25, 2002
    Publication date: September 25, 2003
    Applicant: International Business Machines Corporation
    Inventors: Peter Kui Ho, Mantle Man-Hon Yu
  • State estimator alteration for odd sample times in a disk drive servo control system
    Patent number: 6219198
    Abstract: A direct access storage device (DASD) servo control system includes a servo controller that makes an estimate of disk actuator arm position and velocity as for a regular, expected PES signal sample time, and then alters the estimate for an odd sample time using a simplified estimation function. The altered estimate is generated after determining the amount of time by which the odd sample time is longer than the regular sample time. An odd sample time event is recognized and the odd sample time is forced longer than the regular sample time by skipping a disk control signal computation interval. In this way, the estimated position and velocity of the disk arm is improved for odd sample times, even where the change in one PES sample time may be unrelated to the change in any subsequent PES sample times.
    Type: Grant
    Filed: July 14, 1998
    Date of Patent: April 17, 2001
    Assignee: International Business Machines Corporation
    Inventors: Jeffrey Joseph Dobbek, Peter Kui Ho, Louis Joseph Serrano