Patents by Inventor Steven C Ehret

Steven C Ehret 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).

  • High bandwidth large stroke spin-stand
    Patent number: 7154699
    Abstract: A high bandwidth, large stroke spin-stand for testing components of a disc drive includes a coarse positioning stage and a rotary micropositioning stage. The spin-stand is capable of positioning a transducer head relative to the data storage disc based on one or both of: (1) an angular position of a rotary actuator arm in the rotary micropositioning stage; and (2) servo data read from the data storage disc. The angular position of the rotary actuator arm is detected by an encoder. In one embodiment, position adjustments are based on the detected angular position. In another embodiment, position adjustments are based on servo data read from the data storage disc, but are also conditional on angular position being consistent with the servo data. In yet another embodiment, both angular position and servo data from a track are linearized to generate PES adjustment parameters that are recorded on the data storage disc to redefine the track as more circular or to linearize the PES.
    Type: Grant
    Filed: December 31, 2001
    Date of Patent: December 26, 2006
    Assignee: Seagate Technology LLC
    Inventors: Pradeep K. Subrahamanyan, Patrick J. Korkowski, Waleed A. Farahat, Steven C Ehret, Gregg J. Severson, Thomas S Rasmussen, Albert Van der Schans, Alexei H. Sacks, James H. McGlennen
  • High bandwidth large stroke spin-stand for data storage component testing
    Publication number: 20030002198
    Abstract: A high bandwidth, large stroke spin-stand for testing components of a disc drive includes a coarse positioning stage and a rotary micropositioning stage. The spin-stand is capable of positioning a transducer head relative to the data storage disc based on one or both of: (1) an angular position of a rotary actuator arm in the rotary micropositioning stage; and (2) servo data read from the data storage disc. The angular position of the rotary actuator arm is detected by an encoder. In one embodiment, position adjustments are based on the detected angular position. In another embodiment, position adjustments are based on servo data read from the data storage disc, but are also conditional on angular position being consistent with the servo data. In yet another embodiment, both angular position and servo data from a track are linearized to generate PES adjustment parameters that are recorded on the data storage disc to redefine the track as more circular or to linearize the PES.
    Type: Application
    Filed: December 31, 2001
    Publication date: January 2, 2003
    Inventors: Pradeep K. Subrahamanyan, Patrick J. Korkowski, Waleed A. Farahat, Steven C. Ehret, Gregg J. Severson, Thomas S. Rasmussen, Albert Van der Schans, Alexei H. Sacks, James H. McGlennen