Patents by Inventor Darren W. Karns

Darren W. Karns 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).

  • Light source power control for heat assisted magnetic recording (HAMR)
    Patent number: 8824249
    Abstract: Apparatus and method for light source power control during the writing of data to a storage medium. In accordance with various embodiments, a data recording head is provided having a magnetic transducer and a light source. The light source is driven at a first power level to irradiate an adjacent storage medium prior to the writing if data to the medium using the magnetic transducer. The first power level is insufficient to alter a magnetization state of the medium. The light source is subsequently transitioned to a higher, second power level to irradiate the storage medium during the writing of data to said medium using the magnetic transducer, the second power level being sufficient to alter said magnetization state of the medium.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: September 2, 2014
    Assignee: Seagate Technology LLC
    Inventors: Mehmet Fatih Erden, Edward Charles Gage, Darren W. Karns, Yimin Niu, Kaizhong Gao
  • Light Source Power Control for Heat Assisted Magnetic Recording (HAMR)
    Publication number: 20130294207
    Abstract: Apparatus and method for light source power control during the writing of data to a storage medium. In accordance with various embodiments, a data recording head is provided having a magnetic transducer and a light source. The light source is driven at a first power level to irradiate an adjacent storage medium prior to the writing if data to the medium using the magnetic transducer. The first power level is insufficient to alter a magnetization state of the medium. The light source is subsequently transitioned to a higher, second power level to irradiate the storage medium during the writing of data to said medium using the magnetic transducer, the second power level being sufficient to alter said magnetization state of the medium.
    Type: Application
    Filed: July 1, 2013
    Publication date: November 7, 2013
    Inventors: Mehmet Fatih Erden, Edward Charles Gage, Darren W. Karns, Yimin Niu, Kaizhong Gao
  • Light source power control for heat assisted magnetic recording (HAMR)
    Patent number: 8477569
    Abstract: Apparatus and method for light source power control during the writing of data to a storage medium. In accordance with various embodiments, a data recording head is provided having a magnetic transducer and a light source. The light source is driven at a first power level to irradiate an adjacent storage medium prior to the writing if data to the medium using the magnetic transducer. The first power level is insufficient to alter a magnetization state of the medium. The light source is subsequently transitioned to a higher, second power level to irradiate the storage medium during the writing of data to said medium using the magnetic transducer, the second power level being sufficient to alter said magnetization state of the medium.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: July 2, 2013
    Assignee: Seagate Technology LLC
    Inventors: Mehmet Fatih Erden, Edward Charles Gage, Darren W. Karns, Yimin Niu, Kaizhong Gao
  • LIGHT SOURCE POWER CONTROL FOR HEAT ASSISTED MAGNETIC RECORDING (HAMR)
    Publication number: 20110205861
    Abstract: Apparatus and method for light source power control during the writing of data to a storage medium. In accordance with various embodiments, a data recording head is provided having a magnetic transducer and a light source. The light source is driven at a first power level to irradiate an adjacent storage medium prior to the writing if data to the medium using the magnetic transducer. The first power level is insufficient to alter a magnetization state of the medium. The light source is subsequently transitioned to a higher, second power level to irradiate the storage medium during the writing of data to said medium using the magnetic transducer, the second power level being sufficient to alter said magnetization state of the medium.
    Type: Application
    Filed: February 23, 2011
    Publication date: August 25, 2011
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mehmet Fatih Erden, Edward Charles Gage, Darren W. Karns, Yimin Niu, Kaizhong Gao
  • Positioning of a head array over a data storage medium
    Patent number: 7265937
    Abstract: A data storage system in which multiple readback signals are resolved is provided. The data storage system includes a data storage medium configured to store servo marks and data marks. The data storage medium has tracks that are divided into sectors. An array of heads is configured to interact with the data storage medium. A demodulation circuit receives servo signals obtained by at least some heads of the array of heads and computes a resultant servo signal, which is used to adjust a position of the array of heads over the storage medium.
    Type: Grant
    Filed: June 9, 2006
    Date of Patent: September 4, 2007
    Assignee: Seagate Technology LLC
    Inventors: Mehmet F. Erden, Mark D. Bedillion, Erozan M. Kurtas, Xueshi Yang, Darren W. Karns