Patents Assigned to Seagate Technology LLC
  • Media write operation
    Patent number: 9875030
    Abstract: A method or system comprises determining an end data track of a write operation in response to a request for the write operation in a media storage device, saving data from an adjacent track following the end data track to a cache, performing the write operation. In one implementation, performing the write operation is comprises writing data to a plurality of data tracks in a band.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: January 23, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Thein Than Zaw, Shen Feng
  • Slider utilizing multiple transducer sets
    Patent number: 9875758
    Abstract: A slider includes an array of two or more transducer sets offset from one another in a cross-track direction. Each transducer set includes at least one writer and at least one reader. All of the transducer sets are configured to operate simultaneously to perform any combination of reading and writing on two or more tracks of a recording medium. At least one actuator is included between two the transducer sets. The actuator is configured to adjust a cross-track spacing between the two transducer sets in response to a control current.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: January 23, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jon D. Trantham, Jason Bryce Gadbois, Mehmet Fatih Erden
  • Bolometer for internal laser power monitoring in heat-assisted magnetic recording device
    Patent number: 9875767
    Abstract: An apparatus comprises a slider having an air-bearing surface (ABS), a write pole at or near the ABS, and a reader at or near the ABS and connected to a pair of reader bond pads of the slider. A near-field transducer (NFT) is formed on the slider at or near the ABS, and an optical waveguide is formed in the slider and configured to receive light from a laser source. A sensor is situated proximal of the write pole at a location within the slider that receives at least some of the light communicated along the waveguide. The sensor may be electrically coupled to the reader bond pads in parallel with the reader, and configured to generate a signal indicative of output optical power of the laser source.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: January 23, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: John Charles Duda, Ruoxi Yang, James Gary Wessel
  • Head-medium contact sensor cleaning for heat-assisted magnetic recording device
    Patent number: 9875764
    Abstract: A slider is configured for heat-assisted magnetic recording to a magnetic recording medium. A low- or non-modulation interface is defined between the slider and the medium. A contaminant is present on the slider and between the slider and the medium. A controller is configured to control the slider to dislodge the contaminant from the slider by performing modulation-based contact detection at a location of the medium where modulation-based contact detection can accurately detect head-medium contact. The controller is also configured to perform friction-based contact detection using the slider devoid of the contaminant.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: January 23, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Jason W. Riddering
  • Adjusting track width to compensate for offset writing of a track
    Patent number: 9875757
    Abstract: An offset from track center of a writer that is writing to a track of a magnetic recording medium is determined. A write current applied to a write coil of the writer is adjusted to compensate for the offset. The adjusting of the write current affects a width of the track.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: January 23, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Xiong Liu, Quan Li
  • Recovering user data from a variably encroached data track
    Patent number: 9875763
    Abstract: Method and apparatus for recovering user data from a rotatable data recording medium. In some embodiments, a moveable read element detects at least one uncorrectable read error in user data stored in a data sector arranged along a concentric track. A read retry operation is carried out to recover the user data by radially advancing the moveable read element from a first offset value to a different second offset value with respect to the track in accordance with a trajectory profile while transducing the user data from the data sector. This allows data that are variably overwritten (encroached upon) by different radial amounts from an adjacent track to be recovered.
    Type: Grant
    Filed: October 24, 2016
    Date of Patent: January 23, 2018
    Assignee: Seagate Technology LLC
    Inventors: Jason C. Jury, Siong Liu, Joshua W. Christensen
  • Gradient-index lens with tilted sidewall
    Patent number: 9875761
    Abstract: A gradient-index lens couples light from a laser active region to a waveguide core. The gradient-index lens includes a plurality of bilayers, each of the bilayers having first and second material of respective first and second refractive indices. The bilayers conform to a planar base of the gradient-index lens and further conform to input and output sidewalls of the gradient-index lens. The input sidewall faces the laser active region and the output sidewall faces away from the laser active region. The input and output sidewalls are tilted at respective acute angles relative to the planar base.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: January 23, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Reyad Mehfuz, Aidan Dominic Goggin, Kelly Elizabeth Hamilton, John Bernard McGurk
  • Interconnect interposer attachable to a trailing edge of a slider
    Patent number: 9875760
    Abstract: A slider of a magnetic recording head comprises a media-facing surface, an upper surface opposing the media-facing surface, a leading edge, and a trailing edge. A plurality of electrical bond pads is disposed in a spaced-apart relationship on the trailing edge of the slider. An interconnect interposer is connected to the trailing edge of the slider. The interposer comprises a back side comprising a plurality of electrical contacts in contact with the plurality of bond pads on the trailing edge of the slider. The interposer also comprises a front side comprising a plurality of electrical interposer pads corresponding in number to the plurality of electrical contacts on the back side. The interposer further comprises a plurality of conductors each of which electrically couples one of the plurality of electrical contacts on the back side with one of the plurality of interposer pads on the front side.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: January 23, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Kevin Anthony McNeill, Lars Ahlen, Jason Bryce Gadbois, James Gary Wessel, Bradley Ver Meer
  • ENCRYPTING SYSTEM LEVEL DATA STRUCTURES
    Publication number: 20180018469
    Abstract: Systems and methods for encrypting system level data structures are described. In one embodiment, a storage system may include a storage drive and at least one controller for the storage drive. In some embodiments, the at least one controller may be configured to identify user data assigned to be stored on the storage drive, encrypt the user data, identify a system data structure generated in relation to the user data, and encrypt the system data structure. In some cases, the data structure may include at least one of metadata, system data, and data encapsulation relative to the user data. In some embodiments, the user data and the data structure may be encrypted with one or more encryption keys programmed on the storage drive.
    Type: Application
    Filed: July 15, 2016
    Publication date: January 18, 2018
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Robert W. Moss, Stacey Secatch, Kristofer C. Conklin, Dana L. Simonson
  • WIRELESS ENABLED SECURE STORAGE DRIVE
    Publication number: 20180020011
    Abstract: Systems and methods for wireless enabled security in relation to a storage drive are described. In one embodiment, the systems and methods may include receiving, at a storage drive, a request from a host of the storage drive. In some cases, the request may be received via a wired connection between the storage drive and the host.
    Type: Application
    Filed: July 15, 2016
    Publication date: January 18, 2018
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventor: Christopher Nicholas Allo
  • HASH AUTHENTICATED DATA
    Publication number: 20180019876
    Abstract: Systems and methods for hash authenticated data are described. In one embodiment, the storage device includes a storage drive and/or a controller. In some embodiments, the controller is configured to identify data to be authenticated, compute a first hash of the data using a hash function, detect a trigger event associated with the storage drive, and authenticate, after the trigger event, the data based at least in part on the first hash of the data.
    Type: Application
    Filed: July 15, 2016
    Publication date: January 18, 2018
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Robert W. Moss, Stacey Secatch, Dana L. Simonson, Kristofer C. Conklin
  • Stabilization of one or more upper sensors in multi-sensor readers
    Patent number: 9870791
    Abstract: A multi-sensor reader that includes a first sensor that has a first sensor stack, which includes a sensing layer that has a magnetization that changes according to an external magnetic field. The first sensor also includes a first seed layer below the first sensor stack. The multi-sensor reader also includes a second sensor stacked over the first sensor. The second sensor includes a second sensor stack, which includes a sensing layer that has a magnetization that changes according to the external magnetic field. The second sensor also includes a second seed layer below the second sensor stack. A stabilization element is included to maintain a magnetization direction of the second seed layer and to stabilize the second seed layer.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: January 16, 2018
    Assignee: Seagate Technology LLC
    Inventors: Victor Sapozhnikov, Steven P. Bozeman, Mohammed Shariat Ullah Patwari, LiWen Tan, Jae Young Yi, Eric W. Singleton
  • Materials for near field transducers and near field transducers containing same
    Patent number: 9870793
    Abstract: A method of forming a near field transducer (NFT) layer, the method including depositing a film of a primary element, the film having a film thickness and a film expanse; and implanting at least one secondary element into the primary element, wherein the NFT layer includes the film of the primary element doped with the at least one secondary element.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: January 16, 2018
    Assignee: Seagate Technology LLC
    Inventors: Sethuraman Jayashankar, Michael C. Kautzky
  • Photon emitter array including photon emitters with different orientations
    Patent number: 9869639
    Abstract: Provided herein is an apparatus including a photon emitter array. The photon emitter array includes a number of photon emitters selectively oriented in a number of polarized orientations. The photon emitters are configured to controllably emit photons onto a surface of an article. The apparatus also includes a photon detector positioned to receive photons scattered from features on the surface of the article. The photon detector simultaneously receives photons oriented in the number of polarized orientations. In addition, the photon detector provides information for mapping the features on the surface of the article.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: January 16, 2018
    Assignee: Seagate Technology LLC
    Inventors: Joachim Walter Ahner, David Marcus Tung
  • Recessed AFM stitch interface engineering
    Patent number: 9870790
    Abstract: A read sensor and fabrication method thereof. The method includes forming a bottom stack that includes an antiferromagnetic (AFM) layer, a lower ferromagnetic stitch layer above the AFM layer and a sacrificial cap layer on the lower ferromagnetic stitch layer. The sacrificial cap layer is formed of a material that alloys magnetically with the lower ferromagnetic stitch layer. The method further includes substantially removing the sacrificial cap layer. After substantially removing the sacrificial layer, an upper ferromagnetic stitch layer is deposited on the lower ferromagnetic stitch layer of the bottom stack to form a stitch interface that provides relatively strong magnetic coupling between the lower ferromagnetic stitch layer of the bottom stack and the upper ferromagnetic stitch layer.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: January 16, 2018
    Assignee: Seagate Technology LLC
    Inventors: Sameh Hassan, Yuqing Du, Marcus Ormston, Denis O'Donnell, Kevin McNeill
  • Bolometer with low scattering for a heat-assisted magnetic recording slider
    Patent number: 9870787
    Abstract: A slider configured for heat-assisted magnetic recording has an upper surface, an opposing air bearing surface (ABS), and a body defined between the upper surface and the ABS. The slider comprises a write pole and a near-field transducer (NFT) at or near the ABS. An optical waveguide is configured to receive light from a laser source and comprises a first cladding layer, a second cladding layer, and a core between the first and second cladding layers. The core has a width, a length, and a longitudinal axis oriented along the length of the core. A bolometer is situated within the body of the slider at a location that receives at least some of the light communicated along the waveguide used during a writing operation. The bolometer is spaced apart from the core and comprises a longitudinal axis that is oriented substantially parallel to the longitudinal axis of the core.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: January 16, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: James Gary Wessel, Chen Wang
  • INDEPENDENT READ THRESHOLD VOLTAGE TRACKING FOR MULTIPLE DEPENDENT READ THRESHOLD VOLTAGES USING SYNDROME WEIGHTS
    Publication number: 20180012663
    Abstract: Independent read threshold voltage tracking techniques are provided for multiple dependent read threshold voltages using syndrome weights.
    Type: Application
    Filed: June 30, 2017
    Publication date: January 11, 2018
    Applicant: Seagate Technology LLC
    Inventors: AbdelHakim S. Alhussien, Sundararajan Sankaranarayanan, Erich F. Haratsch
  • ADAPTIVE READ THRESHOLD VOLTAGE TRACKING WITH BIT ERROR RATE ESTIMATION BASED ON NON-LINEAR SYNDROME WEIGHT MAPPING
    Publication number: 20180011753
    Abstract: Adaptive read threshold voltage tracking techniques are provided that employ bit error rate estimation based on a non-linear syndrome weight mapping. An exemplary device comprises a controller configured to determine a bit error rate for at least one of a plurality of read threshold voltages in a memory using a non-linear mapping of a syndrome weight to the bit error rate for the at least one of the plurality of read threshold voltages.
    Type: Application
    Filed: June 30, 2017
    Publication date: January 11, 2018
    Applicant: Seagate Technology LLC
    Inventors: AbdelHakim S. Alhussien, Sundararajan Sankaranarayanan, Erich F. Haratsch
  • Reflective surfaces for surface features of an article
    Patent number: 9863876
    Abstract: Provided herein is an apparatus including a photon emitter configured for reflecting photons from a surface of an article onto a first reflective surface. In addition, a second reflective surface is configured for reflecting photons from the surface of the article back onto the surface of the article. The apparatus also includes a detector configured to provide information corresponding to photons scattered from features of the article.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: January 9, 2018
    Assignee: Seagate Technology LLC
    Inventors: Joachim W. Ahner, David M. Tung, Stephen Keith McLaurin, Travis W. Grodt
  • Heat-assisted magnetic recording device capable of laser calibration during a background operation
    Patent number: 9865296
    Abstract: A storage device performs a background operation involving seeking a read/write head between inner and outer diameters of a disk of the storage device. During the seeking, adjacent test tracks are written at a diameter between the inner and outer diameters of the disk. The adjacent test tracks are written using varying levels of laser power applied to the disk via the read/write head. An optimum value of the laser power is determined based on reading at least one of the adjacent test tracks.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: January 9, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Tze Pin Chin, Tanghe Guo, Feng Shen