Patents Assigned to Seagate Technologies
  • THRESHOLD VOLTAGE CALIBRATION USING REFERENCE PATTERN DETECTION
    Publication number: 20140347923
    Abstract: A memory controller identifies a predominant type of error of a memory unit of solid state memory cells. An error type differential is calculated. The error type differential is a difference between a number of charge loss errors and a number of charge gain errors of the memory unit. A VT offset error differential is calculated. The VT offset error differential is a difference between a number of errors of the predominant type at a first VT offset and a number of errors of the predominant type at a second VT offset. A VT offset is determined using a ratio of the error type differential and the VT offset error differential.
    Type: Application
    Filed: May 23, 2013
    Publication date: November 27, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mai A. Ghaly, Rodney Virgil Bowman
  • Magnetic read head with a read function feature
    Patent number: 8896972
    Abstract: In some examples, a system comprising a data storage member including a magnetic storage medium, the magnetic storage medium having a plurality of magnetic bit domains aligned on at least one data track, where a transition boundary between respective magnetic bit domains defines a transition curvature. The system may further comprise a magnetic read head including a first shield layer, a second shield layer, and a read sensor stack provided proximate to the first and second shield layers, where the magnetic read head senses a magnetic field of each of the plurality of magnetic bit domains according to a read playback sensitivity function. In some examples, the shield layers and read sensor stack may be configured to provide a reader playback sensitivity function that substantially corresponds to the shape of the respective magnetic bit domains.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Xilin Peng, Zhongyan Wang, Yonghua Chen
  • Reader positioning in shingled magnetic recording
    Patent number: 8896961
    Abstract: Systems and methods are disclosed for positioning of a reader element in a data storage device employing shingled recording. In an embodiment, a system may comprise a data storage medium configured to store data in a shingled manner where at least one track is partially overlapped by an adjacent track, a read element to read data from the data storage medium, and a processor. The processor may be configured to receive a read command to retrieve data from the data storage medium, and when the data is stored to a shingled portion of the data storage medium, adjust a position of the read element according to a squeeze offset value based on an amount of overwrite of a shingled data track by an adjacent data track.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventor: Peter S Harllee, III
  • Method of creating two-sided template from a single recorded master
    Patent number: 8895127
    Abstract: The embodiments disclose a method of creating two-sided template from a single recorded master, including fabricating a first template using a single recorded master, wherein the first template has a changed duty cycle and an unchanged servo arc orientation, creating a replicate of the first template, wherein the replicate has a mirrored servo arc orientation and a changed duty cycle and fabricating a second template using the replicate to produce a predetermined mirrored servo arc orientation and a predetermined duty cycle for imprinting on a second side of a patterned stack.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventors: David Kuo, Gennady Gauzner, Kim Yang Lee
  • Patterning embedded control lines for vertically stacked semiconductor elements
    Patent number: 8896070
    Abstract: The present invention is generally directed to an apparatus with embedded (bottom side) control lines for vertically stacked semiconductor elements. In accordance with various embodiments, a first semiconductor wafer is provided with a first facing surface on which a first conductive layer is formed. The first semiconductor wafer is attached to a second semiconductor wafer to form a multi-wafer structure, the second semiconductor wafer having a second facing surface on which a second conductive wafer is formed. The first conductive layer is contactingly bonded to the second conductive layer to form an embedded combined conductive layer within said structure. Portions of the combined conductive layer are removed to form a plurality of spaced apart control lines that extend in a selected length or width dimension through said structure.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventors: Hyung-Kyu Lee, YoungPil Kim, Peter Nicholas Manos, Maroun Khoury, Dadi Setiadi, Chulmin Jung, Hsing-Kuen Liou, Paramasiyan Kamatchi Subramanian, Yongchul Ahn, Jinyoung Kim, Antoine Khoueir
  • Enlarged substrate for magnetic recording medium
    Patent number: 8896964
    Abstract: An enlarged substrate for a magnetic recording medium used in a data storage device such as a hard disc drive (HDD). In some embodiments, an apparatus includes a substrate for a magnetic recording disc for installation in a 3½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 96.9 mm to 100.4 mm. In other embodiments, an apparatus comprises a substrate for a magnetic recording disc for installation in a 2½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 66.9 mm to 71.8 mm. In other embodiments, a data storage device has a magnetic recording medium that uses an enlarged substrate as set forth above.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventors: Koji Adachi, Ian J. Beresford, Thomas Y. Chang, Kuo Hsing Hwang, Jim P. Hennessy, David Perez
  • Statistical adaptive error correction for a flash memory
    Patent number: 8898549
    Abstract: A method for implementing adaptive error correction in a memory, comprising the steps of (A) decoding a page of data read from a memory, (B) selecting one of a plurality of histograms based on a measured code word error rate of the decoded page and (C) applying an error correction code rate based on the selected histogram. The error correction code rate allows the memory to use a minimum number of error correction bits to provide reliable operation of the memory.
    Type: Grant
    Filed: February 12, 2013
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventors: Alexander Hubris, Hao Zhong
  • Solid immersion mirror with fill material between inner and outer sidewalls
    Patent number: 8897105
    Abstract: An apparatus includes a solid immersion mirror with opposing, reflective, inner sidewalls having inner surfaces facing a focal region and outer surfaces opposite the inner surfaces. The solid immersion mirror also include opposing outer sidewalls spaced apart from and facing the outer surfaces of the inner sidewalls, and a fill material between the inner sidewalls and outer sidewalls. The apparatus also includes a near-field transducer located in the focal region proximate a media-facing surface.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventors: Neil Zuckerman, Chris Rea, Scott E. Olson, Zoran Jandric
  • Aligned magnetic insulating feature
    Patent number: 8896971
    Abstract: Various apparatus and associated method embodiments are generally directed to a magnetic stack positioned on an air bearing surface (ABS) and biased to a predetermined magnetization by a bias magnet. The bias magnet can be separated from the magnetic stack and at least one magnetic shield by a self-aligned magnetic insulating feature that is comprised of first and second insulating layers.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventor: Thomas Roy Boonstra
  • ENLARGED SUBSTRATE FOR MAGNETIC RECORDING MEDIUM
    Publication number: 20140340790
    Abstract: An enlarged substrate for a magnetic recording medium used in a data storage device such as a hard disc drive (HDD). In some embodiments, an apparatus includes a substrate for a magnetic recording disc for installation in a 3½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 96.9 mm to 100.4 mm. In other embodiments, an apparatus comprises a substrate for a magnetic recording disc for installation in a 2½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 66.9 mm to 71.8 mm. In other embodiments, a data storage device has a magnetic recording medium that uses an enlarged substrate as set forth above.
    Type: Application
    Filed: October 2, 2013
    Publication date: November 20, 2014
    Applicant: Seagate Technologies LLC
    Inventors: Koji Adachi, Ian J. Beresford, Thomas Y. Chang, Kuo Hsing Hwang, Jim P. Hennessy, David Perez
  • MAGNETORESISTIVE SENSOR
    Publication number: 20140340793
    Abstract: Implementations disclosed herein allow a signal detected by a magnetoresistive (MR) sensor to be improved by providing for one or more regions of reduced anisotropy proximal to a sensor stack within a shielding structure.
    Type: Application
    Filed: May 20, 2013
    Publication date: November 20, 2014
    Applicant: Seagate Technology LLC
    Inventors: Dion Song, Dimitar Velikov Dimitrov, Victor Boris Sapozhnikov, Mohammed Sharia Ullah Patwari
  • Notched disk clamp
    Patent number: 8891202
    Abstract: Provided herein is an apparatus, including a plurality of disk clamp notches spaced about an outer lip of an annular disk clamp; an annular groove in an outer perimeter of a hub; and a mounting point on the hub for at least one disk, wherein the annular disk clamp occupies the annular groove of the hub, clamping the at least one disk onto the hub at the mounting point for the at least one disk.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: November 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: Lynn Bich-Quy Le, Hans Leuthold, Troy M. Herndon, Paco Gregor Flores, Matthew M. McConnell
  • Vapor collection
    Patent number: 8888918
    Abstract: An apparatus for collecting condensed vapor during physical vapor deposition includes an enclosure configured to be placed adjacent to one or more vapor sources in a vacuum chamber. The enclosure includes an internal surface of the enclosure partially enclosing a volume of space configured to receive an object wherein the enclosure is maintained at a cooler temperature than the one or more vapor sources. The internal surface of the enclosure is coupled to one or more drainage gutters drainage drainage gutters.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: November 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: Qian Guo, Mark Smura, Michael Joseph Stirniman, Hamid Riahi Samani
  • Impedance mitigation of a microactuator conductive joint
    Patent number: 8891200
    Abstract: Apparatus and method for mitigating impedance changes in a microactuator conductive joint. In accordance with some embodiments, a microactuating element has a conductive input junction, the junction having dissimilar metals in contact with one another. The microactuating element is adapted to mechanically deform to displace a control object responsive to a micractuation control signal that is applied to the junction. A control circuit applies a bi-directional transition signal to the conductive input junction to reduce an increased impedance of the junction.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: November 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: John C. Purkett, David L. Schell, Robert A. Alt, KarWei Koay
  • Apparatuses and methods for controlling near-field transducer to write pole spacing
    Patent number: 8891205
    Abstract: An apparatus is provided that includes a waveguide adjacent an air bearing surface, a near-field transducer comprising a peg having a side orthogonal to the air bearing surface and a write pole adjacent to the waveguide. The write pole includes a first portion extending towards the air bearing surface at a non-orthogonal angle with respect to the air bearing surface, and a second portion in contact with the first portion comprising a side that extends towards and orthogonally contacts the air bearing surface. The second portion or the write pole defines a gap between the side of the peg orthogonal to the air bearing surface and the side of the second portion of the write pole that extends towards and orthogonally contacts the air bearing surface. A method of making a magnetic recording head that includes the provided apparatus is also disclosed.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: November 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: Hua Zhou, Yongjun Zhao, Chris Rea, Werner Scholz, James G. Wessel
  • Biasing structure for write element domain control in a magnetic writer
    Patent number: 8891204
    Abstract: A magnetic writer includes a write element having a first domain pattern when in a quiescent state and a second domain pattern when in an active state. A biasing structure is configured to induce the write element into the first domain pattern when the magnetic writer is in the quiescent state.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: November 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: Declan Macken, Eric Walter Singleton, Peter Jeremy Czoschke
  • Perpendicular magnetic recording layer with regions having different magnetic anisotropy constants
    Patent number: 8889274
    Abstract: An apparatus having a recording layer of a magnetic material with a concentration of implanted ions that increases in relation to a thickness direction of the recording layer to provide the recording layer with a continuously varied perpendicular magnetic anisotropy constant.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: November 18, 2014
    Assignee: Seagate Technology International
    Inventors: Seong-yong Yoon, Chee-kheng Lim, Hoo-san Lee, Hoon-sang Oh, Sok-hyun Kong
  • Heat source management in data storage device
    Patent number: 8891340
    Abstract: An apparatus and associated method is presently disclosed for a control circuitry capable of managing a heat source used in data storage applications. Various embodiments of the present invention are generally directed to a heat source directed at a data storage medium with a synchronization signal and a serial interface that are each selectively activated via a demultiplexed write gate signal. The selective activation allows for pulsed operation of the heat source resulting in reduced duty cycle and temperature during a write operation.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: November 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: Michael H. Lennard, Robert Matousek
  • MAGNETIC SHIELD BASE LAMINATION
    Publication number: 20140334040
    Abstract: A magnetic element may generally be configured as a read head with at least a magnetic stack that contacts at least one magnetic shield. The magnetic shield can be positioned on top of a base lamination and have at least a predetermined anisotropy and magnetic coercivity corresponding to the base lamination.
    Type: Application
    Filed: May 8, 2013
    Publication date: November 13, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Zhengqi Lu, Daniel Hassett, Jiansheng Xu
  • THREE DIMENSIONAL RESISTIVE MEMORY
    Publication number: 20140332748
    Abstract: A memory device includes a stack of layers comprising a plurality of alternating layers of continuous electrically conductive material word line layers with layers of continuous electrically insulating material. A plurality of vias vertically extend through the stack of layers and a vertical bit line is disposed within each via. A layer of switching material separates the vertical bit line from the stack of layers, thereby forming an array of RRAM cells.
    Type: Application
    Filed: May 13, 2013
    Publication date: November 13, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Antoine Khoueir, YoungPil Kim, Rodney Virgil Bowman