Patents Assigned to Seagate Technolgy, Inc.
  • Patent number: 6233289
    Abstract: Signals indicative of unencoded input data are encoded into a plurality of encoded sequences. A first subset of the plurality of encoded sequences are encoded according to a k constrained code of rate x/y and a second subset of the plurality of unencoded sequences are encoded according to a k constrained code of rate m/n wherein x/y≠m/n. The encoded sequences are transmitted to a partial response channel subject to noise. The encoded sequences are transmitted from the channel to a Viterbi detector having a trellis structure with a preselected, time-dependent pattern to create a time varying trellis structure for limiting a maximum length of parallel paths therethrough. The encoded sequences are detected with a Viterbi detector to provide detected, encoded sequences. The detected, encoded sequences are then decoded to provide an estimate of the input data.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: May 15, 2001
    Assignee: Seagate Technolgy, Inc.
    Inventor: Lisa Fredrickson
  • Patent number: 6150016
    Abstract: A high areal density magnetic recording medium exhibiting high remanent coercivity and high coercivity squareness is formed with a thin CoCrTa intermediate layer to provide appropriate crystalline orientation and surface morphology for nucleation and growth of a magnetic layer thereon. The present invention also enables the use of lower substrate heating temperatures during deposition. Embodiments include depositing an intermediate Co alloy layer comprising about 10 up to about 15 atomic % Cr and about 1 to about 6 atomic % Ta at a thickness of about 1.5 to about 150 .ANG..
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: November 21, 2000
    Assignee: Seagate Technolgy, Inc.
    Inventors: Xing Song, Qixu Chen, Charles Leu, Rajiv Y. Ranjan