Patents by Inventor Dan Gunderson

Dan Gunderson 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).

  • Patent number: 7372651
    Abstract: In one exemplary embodiment, a noise signal is introduced into a read-back signal when data is written to a removable data storage medium. While writing the data to the removable data storage medium, a portion of the data written to the removable data storage medium is read from the removable data storage medium. An error rate is determined based on the portion of the data read from the removable data storage medium. A read-back signal is generated corresponding to the portion of the data read from the removable data storage medium, which is used to detect if an error occurred in writing the portion of the data to the removable data storage medium. A noise signal is added to the read-back signal. The noise signal is adjusted based on the determined error rate.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: May 13, 2008
    Assignee: Quantum Corporation
    Inventors: Dan Gunderson, Mark Moyer, Chung Song, Ryan McCallister
  • Patent number: 7064913
    Abstract: A recording target error rate is selected for one or more of data storage devices, and for each data storage device, a dither value is determined for each read/write head in the data storage device, wherein for each head, using a dither value for writing data, essentially provides the selected recording target error for all the heads.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: June 20, 2006
    Assignee: Quantum Corporation
    Inventors: Dan Gunderson, Doug Gunther
  • Publication number: 20040174629
    Abstract: In one exemplary embodiment, a noise signal is introduced into a read-back signal when data is written to a removable data storage medium. While writing the data to the removable data storage medium, a portion of the data written to the removable data storage medium is read from the removable data storage medium. An error rate is determined based on the portion of the data read from the removable data storage medium. A read-back signal is generated corresponding to the portion of the data read from the removable data storage medium, which is used to detect if an error occurred in writing the portion of the data to the removable data storage medium. A noise signal is added to the read-back signal. The noise signal is adjusted based on the determined error rate.
    Type: Application
    Filed: March 7, 2003
    Publication date: September 9, 2004
    Inventors: Dan Gunderson, Mark Moyer, Chung Song, Ryan McCallister
  • Publication number: 20030128448
    Abstract: A recording target error rate is selected for one or more of data storage devices, and for each data storage device, a dither value is determined for each read/write head in the data storage device, wherein for each head, using a dither value for writing data, essentially provides the selected recording target error for all the heads.
    Type: Application
    Filed: January 9, 2002
    Publication date: July 10, 2003
    Inventors: Dan Gunderson, Doug Gunther