Patents by Inventor Arafat M. Butt

Arafat M. Butt 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).

  • Disk drive having guide-vanes
    Patent number: 7031104
    Abstract: A disk drive includes an enclosure, a rotatable disk and an actuator arm, and also includes a plurality of arcuate channels. Airflow is created within the enclosure when the disk rotates. The plurality of arcuate channels facing the disk to decrease the turbulence of the airflow with respect to the actuator arm. The arcuate channels are formed on at least one portion of the enclosure.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: April 18, 2006
    Assignee: Western Digital Technologies, Inc.
    Inventors: Arafat M. Butt, Raffi Codilian, Kin-Cheok Pong
  • Data storage testing apparatus for delivering linear or rotational acceleration
    Patent number: 7013731
    Abstract: A testing apparatus for use with a data storage component that includes a base platform and a retaining element coupled to the base platform. The retaining element is sized and configured to retain the data storage component. The retaining element is linearly movable relative to the base platform during a linear acceleration mode without substantial rotational movement. The retaining element is rotationally movable relative to the base platform without substantial linear movement during a rotational acceleration mode. The testing apparatus further includes an actuator disposable in mechanical communication with the retaining element for moving the retaining element relative to the base platform.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: March 21, 2006
    Assignee: Western Digital Technologies, Inc.
    Inventors: Wally Szeremeta, Arafat M. Butt, Raffi Codilian
  • Method and disk drive for improving head position accuracy during track following through real-time identification of external vibration and monitoring of write-unsafe occurrences
    Patent number: 6900958
    Abstract: A method is disclosed for improving head position accuracy in a disk drive during track following of concentric data storage tracks through real-time identification of external vibration and monitoring of write-unsafe (WUS) occurrences. In the method, after a seek operation to a predetermined data storage track, the track is followed using a servo control loop having a nominal gain and responsive to a position error signal (PES). After waiting a vibration detection delay period, occurrences of the PES exceeding a WUS limit are counted generating a WUS limit exception count. Also, a property of a variance is determined from spectral power values generated from the PES during track following. If the WUS limit exception count exceeds a first threshold, and if the property of the variance exceeds a second threshold, the nominal gain is increased to a vibration gain within a frequency band, to attenuate the effect of external vibration.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: May 31, 2005
    Assignee: Western Digital Technologies, Inc.
    Inventors: Li Yi, Yanbin Song, David A. Spaulding, Arafat M. Butt, Robert J. McNab, David D. Nguyen