Patents by Inventor Roger J. Justo

Roger J. Justo 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).

  • Dynamically controlling tape velocity
    Patent number: 9361928
    Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: June 7, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Nhan X. Bui, Kevin B. Judd, Roger J. Justo, Hirokazu Nakayama, Tomoko Taketomi
  • DYNAMICALLY CONTROLLING TAPE VELOCITY
    Publication number: 20160086629
    Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.
    Type: Application
    Filed: December 7, 2015
    Publication date: March 24, 2016
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Nhan X. BUI, Kevin B. JUDD, Roger J. JUSTO, Hirokazu NAKAYAMA, Tomoko TAKETOMI
  • Dynamically controlling tape velocity
    Patent number: 9251840
    Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.
    Type: Grant
    Filed: October 3, 2014
    Date of Patent: February 2, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Nhan X. Bui, Kevin B. Judd, Roger J. Justo, Hirokazu Nakayama, Tomoko Taketomi
  • DYNAMICALLY CONTROLLING TAPE VELOCITY
    Publication number: 20150243317
    Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.
    Type: Application
    Filed: October 3, 2014
    Publication date: August 27, 2015
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Nhan X. BUI, Kevin B. JUDD, Roger J. JUSTO, Hirokazu NAKAYAMA, Tomoko TAKETOMI
  • Method and apparatus for controlling data rate of a tape drive
    Patent number: 7796354
    Abstract: A method for controlling data rate of a tape drive is disclosed. The tape drive is connected to a computer system. The tape drive stores data by dividing the data into multiple codeword quads (CQs). A local memory within the tape drive includes drive to iteratively monitor data rate during write operations. If a number of CQ skips exceeds a pre-defined threshold value, the drive code reduces a maximum allowable data rate of the tape drive.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: September 14, 2010
    Assignee: International Business Machines Corporation
    Inventor: Roger J. Justo
  • METHOD AND APPARATUS FOR CONTROLLING DATA RATE OF A TAPE DRIVE
    Publication number: 20090097149
    Abstract: A method for controlling data rate of a tape drive is disclosed. The tape drive is connected to a computer system. The tape drive stores data by dividing the data into multiple codeword quads (CQs). A local memory within the tape drive includes drive to iteratively monitor data rate during write operations. If a number of CQ skips exceeds a pre-defined threshold value, the drive code reduces a maximum allowable data rate of the tape drive.
    Type: Application
    Filed: October 16, 2007
    Publication date: April 16, 2009
    Inventor: ROGER J. JUSTO
  • Optical disk players having readback circuits with noise rejection and read signal retiming
    Patent number: 5165089
    Abstract: In an optical disk player, such as for a magnetooptic player, wherein the data recorded on the optical medium are at recording at such high densities then intersymbol interference causes the peaks of the readback signals to become closer together resulting in phase errors. A transition selecting means is operative to select a transition indicated by the readback signal or a substitute transition indicated by a timed delay means generates a signal based upon the immediately preceding transition received from optical medium. Various embodiments of the invention are illustrated.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: November 17, 1992
    Assignee: International Business Machines Corporation
    Inventors: Glen A. Jaquette, Roger J. Justo