Patents by Inventor Adrián Cerdá

Adrián Cerdá 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 to correct radial misposition of data tracks using stitched correction fields
    Patent number: 7315431
    Abstract: A disk drive measures the radial misposition of tracks and repositions the tracks at regularly spaced intervals. Written in runout (WRO) in servo bursts is determined to calculate track spacing and squeeze among adjacent tracks. Tracks with improper spacing are repositioned by adding a squeeze correction term to the servo wedges. Thereafter, when the disk drive operates to store data, the servo bursts are used to calculate a position error signal (PES), and the squeeze correction term is combined with the PES to position the head at a proper track radius.
    Type: Grant
    Filed: November 15, 2005
    Date of Patent: January 1, 2008
    Assignee: Maxtor Corporation
    Inventors: Stephen Perlmutter, Thomas Melrose, James Hargarten, Don Brunnett, Lloyd Levy, Adrián Cerdá
  • Method and apparatus for performing a spiral self-servo write operation in a disk drive using an auto detection scheme
    Patent number: 7212369
    Abstract: A method and apparatus for providing a temporary utility zone in a disk drive. A disk surface has a write head associated therewith. The write head is used to write spiral servo information and a propagation state indicator onto the disk surface. The spiral servo information and propagation state indicator are used to perform a self-servo write operation on the disk surface.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: May 1, 2007
    Assignee: Maxtor Corporation
    Inventors: Lloyd Levy, Yu Sun, Pang L. Tan, Jingbo Yu, Adrian Cerda
  • Method to correct radial misposition of data tracks
    Patent number: 6965491
    Abstract: A disk drive measures the radial misposition of tracks and repositions the tracks at regularly spaced intervals. Written in runout (WRO) in servo bursts is determined to calculate track spacing and squeeze among adjacent tracks. Tracks with improper spacing are repositioned by adding a squeeze correction term to the servo wedges. Thereafter, when the disk drive operates to store data, the servo bursts are used to calculate a position error signal (PES), and the squeeze correction term is combined with the PES to position the head at a proper track radius.
    Type: Grant
    Filed: June 18, 2002
    Date of Patent: November 15, 2005
    Assignee: Maxtor Corporation
    Inventors: Stephen Perlmutter, Thomas Melrose, James Hargarten, Don Brunnett, Lloyd Levy, Adrián Cerdá