Patents Assigned to Seagate Technologies
  • Double shell writers
    Patent number: 8649124
    Abstract: An apparatus illustratively includes a return pole (RP) and a shield. The RP has a first RP magnetic layer, a second RP magnetic layer, and a RP non-magnetic layer. The RP non-magnetic layer separates and magnetically decouples the RP first and second magnetic layers. The shield has a first shield magnetic layer, a second shield magnetic layer, and a shield non-magnetic layer. The shield non-magnetic layer separates and magnetically decouples the shield first and second magnetic layers. A method illustratively includes generating magnetic flux and collecting the magnetic flux through an inner magnetic shell.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: February 11, 2014
    Assignee: Seagate Technology LLC
    Inventors: Jie Zou, David Seets, James Wessel, Jianhua Xue, Lixin Jia
  • Heat-assisted hermetic spring seal
    Patent number: 8646781
    Abstract: A hermetic seal includes a spring seal compressed with a limited sealing force between sealing surfaces. The sealing surfaces surround a gas-filled cavity that houses heat sensitive components. The hermetic seal includes a film that joins the spring seal to the sealing surfaces. The film includes a material that is softenable by heat to hermetically seal the spring seal to the sealing surfaces. The hermetic seal includes an externally accessible surface for selectively application of the heat to the film, without overheating the heat sensitive components.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: February 11, 2014
    Assignee: Seagate Technology
    Inventor: Neal Frank Gunderson
  • Direct waveguide light delivery to NFT for heat assisted magnetic recording
    Patent number: 8649245
    Abstract: A magnetic recording head comprises a write pole having a pole tip adjacent to an air bearing surface, a return pole, an optical near field transducer positioned adjacent the pole tip and an air bearing surface for exposing a portion of a magnetic storage medium to high energy radiation. The energy is directly provided to the near field transducer by a ridge waveguide with tapered coupling elements, by a two dimensional straight or curved waveguide with a beveled end with a metal/dielectric coating for delivering energy to the near field transducer, or by a curved waveguide. The waveguide with tapered coupling elements or with beveled end can be fabricated by means of conventional wafer processing.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: February 11, 2014
    Assignee: Seagate Technology LLC
    Inventors: Arkadi Goulakov, Kaizhong Gao, Xuhui Jin
  • Method and system for generating a random number in disk drive
    Patent number: 8650234
    Abstract: For generating a random number in a disk drive, a seed is generated from a respective sector number for each of at least one sector of the disk drive. The random number is calculated using the seed. The seed that is generated with enhanced unpredictability and complexity is used to generate the random number for secure data cryptography within the disk drive.
    Type: Grant
    Filed: June 21, 2004
    Date of Patent: February 11, 2014
    Assignee: Seagate Technology LLC
    Inventors: Sung-Youn Cho, Seung-Youl Jeong, Jong-Lak Park, Hak-Yeol Sohn
  • Tunneling transistors
    Patent number: 8648426
    Abstract: A transistor including a source; a drain; a gate region, the gate region including a gate; an island; and a gate oxide, wherein the gate oxide is positioned between the gate and the island; and the gate and island are coactively coupled to each other; and a source barrier and a drain barrier, wherein the source barrier separates the source from the gate region and the drain barrier separates the drain from the gate region.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: February 11, 2014
    Assignee: Seagate Technology LLC
    Inventors: Insik Jin, Wei Tian, Venugopalan Vaithyanathan, Cedric Bedoya, Markus Siegert
  • Heat Source Management in Data Storage Device
    Publication number: 20140036645
    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: Application
    Filed: September 16, 2013
    Publication date: February 6, 2014
    Applicant: Seagate Technology LLC
    Inventors: Michael H. Lennard, Robert Matousek
  • Adhesive height setting
    Patent number: 8641860
    Abstract: Methods for adhering parts together using part gap spacers are provided herein. Part gap spacers are formed in a selected pattern and a selected height on a surface of at least one surface of two parts to be oppositely disposed. When disposed opposite each other, at least some of the part gap spacers contact the opposite surface, and establish a standoff distance that is generally uniform, and thereby creating voids. Adhesive is disposed in at least some of the voids to adhere the part surfaces to each other. Further methods comprise forming part gap spacers on multiple sides of a third part to be disposed intermediate two surfaces. The part gap spacers can be formed in a variety of shapes, including bumps, tapers, ribs, and flange edges.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: February 4, 2014
    Assignee: Seagate Technology LLC
    Inventors: Paco Flores, Anthony J. Aiello, Klaus D. Kloeppel, Reid E. Berry
  • Optical devices including assist layers
    Patent number: 8644124
    Abstract: A waveguide including a first cladding layer, the first cladding layer having an index of refraction, n3; an assist layer, the assist layer having an index of refraction, n2, and the assist layer including ASixOy, wherein A is selected from: Ta, Ti, Nb, Hf, Zr, and Y, x is from about 0.5 to about 2.0, y is from about 3.5 to about 6.5, and the atomic ratio of A/A+Si in ASixOy is from about 0.2 to about 0.7; and a core layer, the core layer including a material having an index of refraction, n1, wherein n1 is greater than n2 and n3, and n2 is greater than n3.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: February 4, 2014
    Assignee: Seagate Technology LLC
    Inventors: Xiaoyue Huang, Michael Christopher Kautzky
  • Information storage medium using nanocrystal particles, method of manufacturing the information storage apparatus including the information storage medium
    Patent number: 8642155
    Abstract: Provided is an information storage medium using nanocrystal particles, a method of manufacturing the information storage medium, and an information storage apparatus including the information storage medium. The information storage medium includes a conductive layer, a first insulating layer formed on the conductive layer, a nanocrystal layer that is formed on the first insulating layer and includes conductive nanocrystal particles that can trap charges, and a second insulating layer formed on the nanocrystal layer.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: February 4, 2014
    Assignee: Seagate Technology LLC
    Inventors: Seung-bum Hong, Simon Buehlmann, Shin-ae Jun, Sung-hoond Choa, Eun-joo Jang, Yong-kwan Kim
  • Intelligent storage device controller
    Patent number: 8645641
    Abstract: In a particular embodiment, a storage device includes a controller that is adapted to receive environmental data from a plurality of environmental sensors, where the environmental data is related to an operating environment of the storage device. Further, the controller is adapted to receive state information related to the data storage medium from a plurality of firmware detectors, to weight the received environmental data and the received state information according to a pre-determined weighting table, and to dynamically manage at least one attribute of the storage device based on the weighted environmental data and the weighted state information.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: February 4, 2014
    Assignee: Seagate Technology LLC
    Inventors: Michael Edward Baum, Jim Joseph Touchton, Timothy Richard Feldman, Mike Montemorra
  • Estimating temporal degradation of non-volatile solid-state memory
    Patent number: 8645773
    Abstract: Representative locations of a non-volatile, solid-state memory of an apparatus store characterization data. An event during which elapsed time is not measured by the apparatus is determined. In response to the event, temporal degradation of the non-volatile, solid-state memory during the event is estimated based on electrical characteristics of the representative locations.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: February 4, 2014
    Assignee: Seagate Technology LLC
    Inventors: Ryan James Goss, David Scott Seekins, Mark Allen Gaertner
  • HEAT ASSISTED MAGNETIC RECORDING DEVICE WITH PRE-HEATED WRITE ELEMENT
    Publication number: 20140029396
    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: Application
    Filed: March 14, 2013
    Publication date: January 30, 2014
    Applicant: 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
  • Detection System Using Heating Element Temperature Oscillations
    Publication number: 20140029402
    Abstract: A data storage system includes a recording head and a compensating resistor. The recording head has a heating element. The compensating resistor is in electrical series with the heating element and is external to the recording head. A method includes applying an alternating current at a first angular frequency to a recording head. A voltage drop across the recording head heating element is measured. A component of the voltage drop is extracted. The component has a frequency that is three times the frequency of the first angular frequency.
    Type: Application
    Filed: September 3, 2013
    Publication date: January 30, 2014
    Applicant: Seagate Technology LLC
    Inventors: Xuan Zheng, Timothy William Stoebe
  • Head-medium contact detection using introduced heat oscillation
    Patent number: 8638349
    Abstract: An apparatus includes a head transducer configured to interact with a magnetic recording medium and a heater configured to thermally actuate the head transducer. A thermal sensor at or near the head transducer is configured to produce a sensor signal. Circuitry is coupled to the heater and configured to cause an oscillation in heater power. The heater power oscillation causes an oscillation in the sensor signal. A detector is coupled to the thermal sensor and configured to detect head-medium contact using the oscillating sensor signal and heater power.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: January 28, 2014
    Assignee: Seagate Technology LLC
    Inventors: Dongming Liu, Kenneth Haapala, Scott E. Ryun, Lin Zhou
  • Method of making a fluid bearing
    Patent number: 8635764
    Abstract: A system is provided that increases the spindle stiffness of a disk drive while optimizing power consumption. A multipurpose bearing provides axial stiffness and enhanced stiffness against radial and pitch loads applied to the spindle. When used in combination with a journal bearing, conventional thrust bearings may be eliminated without sacrificing overall stiffness. As a result, the height of the disk drive may be reduced, thereby making the system desirable to be used in smaller electronic devices.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: January 28, 2014
    Assignee: Seagate Technology LLC
    Inventors: Diep Nguyen, Hamid Salehizadeh
  • Channel architecture with multiple signal processing branches for a given physical channel
    Patent number: 8638891
    Abstract: A communication system includes a physical communication channel. A signal is transmitted across the communication channel from a transmit end of the channel to a receive end of the channel. A plurality of processing branches process the signal at the receive end of the communication channel. This reduces complexity of the receive channel, without reducing a bandwidth of the given communication channel, and without comprising performance.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: January 28, 2014
    Assignee: Seagate Technology LLC
    Inventor: Mehmet Fatih Erden
  • Bit line charge accumulation sensing for resistive changing memory
    Patent number: 8638597
    Abstract: A memory array includes a plurality of magneto-resistive changing memory cells. Each resistive changing memory cell is electrically between a source line and a bit line and a transistor electrically between the resistive changing memory cell and the bit line. The transistor has a gate electrically between a source region and a drain region and the source region being electrically between the r magneto-resistive changing memory cell and the gate. A word line is electrically coupled to the gate. A bit line charge accumulation sensing for magneto-resistive changing memory is also disclosed.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: January 28, 2014
    Assignee: Seagate Technology LLC
    Inventors: Chulmin Jung, Yong Lu, Kang Yong Kim, Young Pil Kim
  • FLUID PUMPING CAPILLARY SEAL FOR A FLUID DYNAMIC BEARING
    Publication number: 20140023300
    Abstract: An apparatus and method are provided for a robust and shock resistant fluid dynamic bearing. A fluid sealing system with fluid pumping and capillary features provides increased reliability and performance for small form factor disc drive memory systems. Concerns of motor jog are addressed, jog being the rapid and repeated opening and closing of spaces between relatively rotatable components that can dispel oil from, or draw air into, these spaces. The fluid pumping capillary sealing system includes a fluid pumping groove with a rib portion and a slot portion for pumping fluid. The fluid pumping capillary sealing system also includes a capillary seal. In an aspect, a sweeping rib sweeps fluid toward the bearing. A truncated rib is situated adjacent to the sweeping rib, the truncated rib extending a shorter radial distance as compared to the sweeping rib and forming a plenum region.
    Type: Application
    Filed: September 20, 2013
    Publication date: January 23, 2014
    Applicant: Seagate Technology LLC
    Inventors: Alan Lyndon Grantz, Lynn Bich-Quy Le, Klaus Diete Kloeppel
  • SYSTEM AND METHOD FOR MANAGING STORAGE DEVICE CACHING
    Publication number: 20140025868
    Abstract: Systems and methods are disclosed for caching data according to user-selected caching modes. In an embodiment, an apparatus may comprise a controller configured to pin data from a non-volatile storage medium to a data cache based on at least one user-selectable caching mode. In another embodiment, a device may comprise a processor configured to display a graphical user interface (GUI) at a display, and receive, from the GUI, an indication of a user selection of a data caching mode that determines which data to pin from a non-volatile memory of a data storage device to a data cache of the data storage device. The processor may be configured to then send an indication of the user selection of the data caching mode to the data storage device.
    Type: Application
    Filed: July 29, 2013
    Publication date: January 23, 2014
    Applicant: Seagate Technology LLC
    Inventor: Martin R. Furuhjelm
  • RANDOM BIT GENERATOR WITH MAGNETIC TUNNEL JUNCTION
    Publication number: 20140022837
    Abstract: Devices and methods for generating a random number that utilizes a magnetic tunnel junction are disclosed. An AC current source can be in electrical connection to a magnetic tunnel junction to provide an AC current to the magnetic tunnel junction. A read circuit can be used to determine a bit based on a state of the magnetic tunnel junction. A rate of production of the bits can be adjusted, such as by adjusting a frequency or amplitude of the AC current. A probability of obtaining a “0” or “1” bit can be managed, such as by an addition of DC biasing to the AC current.
    Type: Application
    Filed: July 22, 2013
    Publication date: January 23, 2014
    Applicant: Seagate Technology LLC
    Inventors: Xiaobin Wang, Wenzhong Zhu, Henry Huang, Yiran Chen, Haiwen Xi