Patents by Inventor Wayne A. Rogelstad

Wayne A. Rogelstad 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).

  • Self servo writing file
    Patent number: 6040955
    Abstract: A self servo writing file and method for writing servo patterns in a direct access storage device are provided. First servo information is written on a data storage media at a first crash stop. The transducer heads are moved offset from the written servo information while reading the last written servo information until the detected servo signal equals a predetermined value. Then servo information is written on the data storage media responsive to the detected servo signal equal to the predetermined value. The moving and writing steps are sequentially repeating until a second crash stop is reached. A quad-burst servo amplitude pattern or phase pattern can be used for the servo information. The servo writing method is adapted easily for many different servo options. When the file uses a hybrid servo or sector servo, the other surfaces can be written by duplicating the servo bursts with a high bandwidth servo system of the file.
    Type: Grant
    Filed: August 8, 1994
    Date of Patent: March 21, 2000
    Assignee: International Business Machines Corporation
    Inventors: Dana Henry Brown, Thomas Charles Christensen, Earl A. Cunningham, Wayne A. Rogelstad
  • Self servo writing file using the widest head
    Patent number: 5949603
    Abstract: A self servo writing file and method for writing servo patterns in a direct access storage device are provided. First servo information is written on a data storage media at a first crash stop. The transducer heads are moved offset from the written servo information while reading the last written servo information until the detected servo signal equals a predetermined value. Then servo information is written on the data storage media responsive to the detected servo signal equal to the predetermined value. The moving and writing steps are sequentially repeated until a second crash stop is reached. A quad-burst servo amplitude pattern or phase pattern can be used for the servo information. The servo writing method is adapted easily for many different servo options. When the file uses a hybrid servo or sector servo, the other surfaces can be written by duplicating the servo bursts with a high bandwidth servo system of the file.
    Type: Grant
    Filed: January 4, 1999
    Date of Patent: September 7, 1999
    Assignee: International Business Machines Corporation
    Inventors: Dana Henry Brown, Thomas Charles Christensen, Earl A. Cunningham, Wayne A. Rogelstad
  • Self servo writing file
    Patent number: 5570247
    Abstract: A self servo writing file and method for writing servo patterns in a direct access storage device are provided. First servo information is written on a data storage media at a first crash stop. The transducer heads are moved offset from the written servo information while reading the last written servo information until the detected servo signal equals a predetermined value. Then servo information is written on the data storage media responsive to the detected servo signal equal to the predetermined value. The moving and writing steps are sequentially repeated until a second crash stop is reached. A quad-burst servo amplitude pattern or phase pattern can be used for the servo information. The servo writing method is adapted easily for many different servo options. When the file uses a hybrid servo or sector servo, the other surfaces can be written by duplicating the servo bursts with a high bandwidth servo system of the file.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: October 29, 1996
    Assignee: International Business Machines Corporation
    Inventors: Dana H. Brown, Thomas C. Christensen, Earl A. Cunningham, Wayne A. Rogelstad