Patents Assigned to Seagate Technologies
  • Flash memory read error recovery with soft-decision decode
    Patent number: 9021332
    Abstract: An apparatus having a circuit and one or more processor is disclosed. The circuit is configured to receive a codeword from a memory. The memory is nonvolatile. The codeword generally has one or more errors. The processors are configured to generate read data by decoding the codeword repeatedly. The decoding includes a soft-decision decoding that uses a plurality of parameters calculated by (i) a first procedure, (ii) a second procedure in response to a plurality of failures of the decoding to converge using the first procedure and (iii) a third procedure in response to another failure of the decoding to converge using the second procedure.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Erich F. Haratsch, Jeremy Werner, Zhengang Chen, Earl T. Cohen, Yunxiang Wu, Ning Chen
  • Heat assisted magnetic recording device with pre-heated write element
    Patent number: 9019646
    Abstract: An apparatus includes a write element configured to apply a magnetic field to write data on a portion of a heat-assisted magnetic recording media in response to an energizing current. An energy source is configured to heat the portion of the media being magnetized by the write element. A preheat energizing current is applied to the write element during an interval before writing the data to the portion of the media. The preheat energizing current does not cause data to be written to the media and brings at least one of the write element and driver circuitry into thermal equilibrium prior to writing the data on the portion.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Tim Rausch, Jon D. Trantham, John West Dykes, Housan Dakroub, Charles Paul Henry, Edward Charles Gage, Raul Horacio Andruet, James Gary Wessel, James Dillon Kiely, Bruce Douglas Buch, Barmeshwar Vikramaditya
  • Lubricants for data storage
    Patent number: 9017834
    Abstract: Disclosed herein are compounds of formula I: X-(L-Z)p-L-R[L-(Z-L)p-Y]q??(I) wherein L is a perfluoropolyether; R is q can be an integer equal to or greater than 1; p can independently be integers from 0 to 7; X and Y can independently be chosen from: —OH, —CH2CH2OH, CH2CH2OCH2CH2OH, —CH2CH(OH)CH2OH, —C6H5, —CH2C6H5, —CH2CH(OH)CH3, F, —CF3, —CF2CF3, piperonyl, triazine, benzotriazole, and derivatives thereof; and Z, if present, can independently be chosen from: —C6H4—, —CH2C6H4CH2—, —CH2CH(OH)CH2—, —CH2CH(OH)CH2CH(OH)CH2—, —CH(OH)CH(OH)CH2—, —CH(CH2OH)—, or —CH(C6H5)—.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Xiaoping Yan, Michael Stirniman, Qian Guo, Wenhong Liu
  • Magnetoresistive sensor with variable shield permeability
    Patent number: 9019664
    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: Grant
    Filed: May 20, 2013
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Dion Song, Dimitar Velikov Dimitrov, Victor Boris Sapozhnikov, Mohammed Sharia Ullah Patwari
  • Patterned magnetic media for magnetic recording
    Patent number: 9017833
    Abstract: A patterned magnetic media is disclosed. The patterned media includes etched recording portions including etched portions of a soft magnetic underlayer. In illustrated embodiments, the soft magnetic layer is etched to form recording bits or etched soft magnetic segments to enhance magnetic field strength in the magnetic recording portions. In other embodiments, soft magnetic layers are deposited in etched regions or areas of the media.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Mourad Benakli, Michael L. Mallary
  • Submount assembly integration
    Patent number: 9018737
    Abstract: In accordance with one embodiment, an apparatus is disclosed that comprises a submount operable to integrate with a laser as a laser submount assembly; a predetermined portion of the submount configured to bond with the laser; a bonding pad positioned on the predetermined portion of the submount for integrating the laser with the submount.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Lijuan Zhong, Edward Charles Gage
  • Magnetic element electrode lamination
    Patent number: 9017832
    Abstract: Various embodiments may be generally directed to a magnetic element capable of optimized magnetoresistive data reading. Such a magnetic element may be configured at least with a magnetoresistive stack that has an electrode lamination having at least a transition metal layer disposed between a magnetically free layer of the magnetoresistive stack and an electrode layer of the electrode lamination.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Eric Walter Singleton, Liwen Tan, Jae-Young Yi
  • Network access firewall
    Patent number: 9021090
    Abstract: The communications management systems manage access to a local area network or network content by external users, applications, and devices. The systems and methods are implemented on a network appliance to manage content within the network and facilitate content transmission through a firewall that separates the network from a larger networking environment, such as the World Wide Web.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: James A. Savage, Tim Bucher
  • Multi-stage actuator with writer position determination capability
    Patent number: 9019650
    Abstract: Apparatus and method for determining a position of a writer supported by a multi-stage actuator. In some embodiments, the apparatus includes a multi-stage actuator which supports a transducer adjacent a data recording surface. The multi-stage actuator has a coarse actuator and a microactuator. The transducer includes a write element and a read element. A controller is adapted to determine a position of a write element of the transducer with respect to the data recording surface responsive to a position of a read element of the transducer and a displacement distance of the microactuator away from a neutral position.
    Type: Grant
    Filed: April 30, 2014
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Ximin Shan, Jye Kai Chang, Sandeep Sequeira
  • Read channel throughput management
    Patent number: 9019640
    Abstract: An implementation of a system disclosed herein provides a method of deferring decoding of a data sector received at a read channel of a storage device, in response to determining that a data sector cannot be decoded by a first decoder and storing the data sector for further processing by a second decoder.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Prafulla Bollampalli Reddy, Hui Su, Michelle Elaine Blankenship, Eddie Wai Pun, John Marc Wright, Ara Patapoutian, Hieu V. Nguyen
  • Grooved limiter
    Patent number: 9016947
    Abstract: Provided herein is an apparatus, including a stationary component and a rotatable component; a fluid between the stationary component and the rotatable component; a limiter shoulder of the stationary component; a flanged limiter bushing of the rotatable component; and a separating means for separating the limiter shoulder and the limiter bushing, wherein the separating means comprises the fluid.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Paco Gregor Flores, Troy M. Herndon, Norbert Steven Parsoneault
  • Lapping carrier having hard and soft properties, and methods
    Patent number: 9017139
    Abstract: A carrier for a slider row bar for a lapping process. The carrier has a mounting structure comprising a material configured to have a first modulus of at least 1,000,000 Pa at a first period of time and a second modulus of 500 Pa to 500,000 Pa at a second period of time subsequent to the first period. The change from the first modulus to the second modulus is due to an external stimulus on the material.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: April 28, 2015
    Assignee: Seagate Technology LLC
    Inventors: Marc Perry Ronshaugen, Joel W. Hoehn
  • Flex circuit with dual sided interconnect structure
    Patent number: 9013963
    Abstract: A flex circuit including a dual sided interconnect structure to connect electrical components on a head or suspension assembly to head circuitry is described. The dual sided interconnect structure described has application for providing an electrical connection to one or more transducer elements on a slider and one or more elements of a heat assisted magnetic recording HAMR unit. In an illustrated embodiment, a flexible structure or insulating base layer includes one or more slider and heat assisted magnetic recording traces coupled to one or more slider or HAMR bond pads on an interconnect portion. As disclosed, the slider bond pads are on the obverse side of the flexible structure and the HAMR bond pads include a reverse side bonding surface to form reverse side bond pads to connect to one or more electrical or heating elements on the HAMR unit.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventors: Bradley J. Ver Meer, Ravishankar Ajjanagadde Shivarama
  • Selective purge of confidential data from a non-volatile memory
    Patent number: 9015401
    Abstract: Method and apparatus for the non-destructive, selective purging of data from a non-volatile memory. In accordance with various embodiments, multiple copies of a selected set of confidential user data having a common logical address are stored to a confidential data portion of a non-volatile memory so that each copy is in a different location within the confidential data portion. A nondestructive purge of all said copies from the confidential data portion is carried out responsive to an externally supplied selective purge command so that all said copies are erased and other, non-purged confidential user data remain stored in the confidential data portion.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventors: Laszlo Hars, Monty Aaron Forehand, Donald Preston Matthews, Jr.
  • Write pole fabricated using a carbon hard mask and method of making
    Patent number: 9013831
    Abstract: A magnetic writer comprises a write pole, a substrate and a non-magnetic, oxygen-free buffer material. The write pole has a leading edge, a trailing edge, a first side and second side. The substrate is at the leading edge of the write pole. The non-magnetic, oxygen-free buffer material is located between the write pole and the substrate, and the oxygen-free buffer material is selected from Re, Ru, Os, Rh, Ir, and combinations thereof.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventor: Michael Christopher Kautzky
  • Low translational load suspension assembly
    Patent number: 9013835
    Abstract: Implementations described and claimed herein address the foregoing problems by providing a suspension assembly used in a storage device to support a transducer head, wherein the suspension assembly comprises a base plate for attaching to an actuator arm and a moving portion movably attached to the base plate. The base plate is fixed and/or clamped to the actuator arm and the moving portion adapted to rotate about a center of rotation. The moving portion is adapted to have a center of mass of its moving mass substantially close to its center of rotation. In one implementation, a counter-weight is attached to the moving portion to move the center of mass of its moving mass substantially close to its center of rotation to minimize inertial loads to the system during suspension actuation.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventor: Paul Y. Chua
  • Method of reducing thermal stress within a magnetic head
    Patent number: 9013820
    Abstract: Devices and methods for reducing thermal stress within a head of a storage device are disclosed. In one or more embodiments, a method includes writing a selected pattern to a storage medium of a storage device using a head of the storage device; reading the selected pattern from the storage medium using the head to provide a data signal; and calculating an instability value of the head based on the data signal. The method can further include reconfiguring the storage device if the instability value is greater than an instability threshold by performing at least one of: deactivating a heater if the head includes two or more heaters; and increasing a fly height between the head and the storage medium.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventors: Clifford Jayson Bringas Camalig, Gan Swee Chuan, Kai K. Yang, Mui Chong Chai
  • Non-circular feature for boss tower engagement
    Patent number: 9013833
    Abstract: A head stack assembly comprising an actuator arm having an aperture therein, a head suspension assembly comprising a load beam having a mounting region with a aperture therein, and a base plate adapted to attach the head suspension assembly to the actuator arm, with the base plate comprising a boss tower having an outside surface and a swaging hole. One of the actuator arm aperture, the boss tower outside surface or the swaging hole is non-circular to provide increased compression between the boss tower and the actuator arm aperture in the roll direction than in the pitch direction. Methods of making a boss tower are also provided.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventors: Prapan Aparimarn, Surawut Onasakorn, Joomponladej Bamrungwongtaree
  • Iterating inner and outer codes for data recovery
    Patent number: 9015549
    Abstract: A storage medium includes at least one data unit defining a plurality of symbol-based inner code words and a plurality of symbol-based outer code words. Each symbol included in one of the inner code words is also included in one of the outer code words. A processor is configured to perform a first iteration of inner code error correction on the plurality of symbol-based inner code words, a first iteration of outer code error correction on the plurality of symbol-based outer code words and a second iteration of inner code error correction on the plurality of symbol-based inner code words. In the first iteration of outer code error corrections, at least one of the outer code words is correctable. In the second iteration of inner code error correction, at least one of the inner code words is correctable.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventors: Bernardo Rub, Ara Patapoutian, Arvind Sridharan, Bruce D. Buch
  • Management of non-valid decision patterns of a soft read retry operation
    Patent number: 9015554
    Abstract: An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to generate an output signal in response to (i) a value retrieved from a look-up table, and (ii) an index signal. The second circuit may be configured to generate the index signal in response to a plurality of page signals. The apparatus may manage decision patterns during a soft retry.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventors: Yunxiang Wu, Ning Chen, Jamal Riani, Hakim Alhussien