Patents Assigned to Seagate Technology
  • Read head stress reduction
    Patent number: 11341989
    Abstract: Systems and methods are disclosed for dynamically adjusting parameters used during a read operation to reduce stress on a read head. In certain embodiments, an apparatus may comprise a read head configured to read data stored to a data storage medium, and a control circuit that controls a parameter of the read head influencing the read head's ability to accurately read data. The control circuit may be configured to extend the working lifespan of the read head by monitoring a read performance of the read head, and adjusting the parameter to reduce the read performance when the read performance is greater than a first threshold.
    Type: Grant
    Filed: September 30, 2020
    Date of Patent: May 24, 2022
    Assignee: Seagate Technology LLC
    Inventor: Peter S. Harllee, III
  • Methods of lapping a substrate while heating at least a portion of the substrate, and related substrates and systems
    Patent number: 11331765
    Abstract: The present disclosure includes methods and systems that include multiple lapping stages having at least one lapping stage that laps while a heat source is applied to cause expansion during lapping and at least one subsequent lapping stage that laps while the heat source is reduced (e.g., turned off).
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: May 17, 2022
    Assignee: Seagate Technology LLC
    Inventors: Andrew Sherve, Neil Zuckerman, Vasudevan Ramaswamy, Andrew Habermas
  • Preserving data integrity during controller failure
    Patent number: 11327858
    Abstract: Systems and processes are disclosed to preserve data integrity during a storage controller failure. In some examples, a storage controller of an active-active controller configuration can back-up data and corresponding cache elements to allow a surviving controller to construct a correct state of a failed controller's write cache. To accomplish this, the systems and processes can implement a relative time stamp for the cache elements that allow the backed-up data to be merged on a block-by-block basis.
    Type: Grant
    Filed: August 11, 2020
    Date of Patent: May 10, 2022
    Assignee: Seagate Technology LLC
    Inventors: Adithya Uligere Narasimhamurthy, Ritvik Viswanatha, Michael Barrell
  • Double loop heater
    Patent number: 11328746
    Abstract: An apparatus comprises a slider comprising an air bearing surface (ABS). The slider comprises a reader, a writer, and a reader heater. The reader heater is configured to cause a protrusion of the ABS proximate the reader, and the reader heater comprises a first planar loop and a second planar loop, wherein the first and second loops are in the same plane.
    Type: Grant
    Filed: January 26, 2021
    Date of Patent: May 10, 2022
    Assignee: Seagate Technology LLC.
    Inventors: Raul Horacio Andruet, Erik Jon Hutchinson
  • Waveguide with optical isolator for heat-assisted magnetic recording
    Patent number: 11328745
    Abstract: An apparatus includes a substrate. A laser is formed on a non-self supporting structure and bonded to the substrate. A waveguide having a gap portion is deposited proximate the laser. The waveguide is configured to communicate light from the laser to a near-field transducer (NFT) that directs energy resulting from plasmonic excitation to a recording medium. An optical isolator is disposed over the gap portion.
    Type: Grant
    Filed: June 29, 2021
    Date of Patent: May 10, 2022
    Assignee: Seagate Technology LLC.
    Inventors: John Bernard McGurk, Reyad Mehfuz, Christopher Neil Harvey, Aidan Dominic Goggin
  • On-wafer integrated laser for heat-assisted magnetic recording
    Patent number: 11328744
    Abstract: An apparatus comprises a substrate. A laser is deposited above the substrate. The laser includes one or more non-self-supporting layers of crystalline material. A metallic adhesive is disposed between the laser and the substrate. The metallic adhesive is configured to adhere the laser to the substrate. A waveguide is deposited proximate the laser. The waveguide is configured to receive light from the laser and direct the light to a recording medium.
    Type: Grant
    Filed: January 29, 2021
    Date of Patent: May 10, 2022
    Assignee: Seagate Technology LLC
    Inventors: Fadi El Hallak, Michael Gerald Boyle, Paula Frances McElhinney, Marcus Benedict Mooney, Aidan Dominic Goggin, Cillian Macdara OBriain Fallon
  • System and method for far-field optical testing of heat-assisted recording heads
    Patent number: 11320367
    Abstract: A testing system includes a production-type laser having optical modes of a production laser that interfaces with an optical path of a heat-assisted magnetic recording (HAMR) slider. A far-field light illumination path delivers excitation light from the production-type laser to the optical path of the HAMR slider, the excitation light being emitted from an air bearing surface (ABS) of the HAMR slider. Optics receive the emitted light from the ABS and distribute the emitted light to one or more sensors. The system determines, based on signals received from the one or more sensors, a depolarization of the emitted light and a coupling efficiency of the HAMR slider. The system may also measure light reflecting out of the optical path and Fourier transform these measurements to determine locations of reflections within the optical path.
    Type: Grant
    Filed: October 9, 2020
    Date of Patent: May 3, 2022
    Assignee: Seagate Technology LLC
    Inventors: Raghu Ambekar Ramachandra Rao, Aaron Edward Patz, Tae-Woo Lee
  • Heat sink arrangements for data storage systems
    Patent number: 11317533
    Abstract: A system includes an enclosure with an air inlet end, an air outlet end, an upper wall, and a lower wall. The system also includes air movers positioned near the air outlet end, a first memory module positioned near the air inlet end at a first orientation, and a second memory module positioned near the air inlet end at a second orientation that is opposite the first orientation.
    Type: Grant
    Filed: September 14, 2020
    Date of Patent: April 26, 2022
    Assignee: Seagate Technology LLC
    Inventor: Mohamad El-Batal
  • Adjusting HGA z-height via HSA elevator using head/actuator feedback
    Patent number: 11315592
    Abstract: A data storage device (DSD) includes a base-deck, a disc above the base-deck, and a shaft extending perpendicular from the base-deck. The DSD also includes a head stack assembly (HSA) including a head gimbal assembly having a load beam and a head at a first end of the HSA. The head interacts with a surface of the disc. The HSA also includes a second end movably mounted on the shaft. The DSD additionally includes an elevator that linearly moves the HSA along the shaft to adjust a distance between the load beam and the surface of the disc in response to receiving a feedback signal associated with the interaction of the head with the surface of the disc. The feedback signal is one of a plurality of feedback signals employed by the elevator to adjust the distance between the load beam and the surface of the disc.
    Type: Grant
    Filed: February 10, 2021
    Date of Patent: April 26, 2022
    Assignee: Seagate Technology LLC
    Inventors: Matthew Aaron Carper, Anil J. Reddy, Brett R. Herdendorf, Riyan Alex Mendonsa
  • SELECTIVELY ROUTING SIGNALS TO DATA STORAGE DEVICES WITHIN A DATA STORAGE SYSTEM THAT INCLUDES A MOVABLE CARRIAGE
    Publication number: 20220122637
    Abstract: An apparatus includes a housing, a data storage magazine configured to hold a plurality of data storage devices, and a movable carriage disposed within the housing that is configured to selectively couple the data storage devices to a host device. The data storage magazine includes a set of magazine signal paths configured to provide signals to the plurality of data storage devices. The movable carriage includes a set of carriage signal paths configured to provide signals to the plurality of data storage devices. The apparatus includes a controller configured to power the plurality of data storage devices by selectively routing the signals via the set of magazine signal paths or the set of carriage signal paths.
    Type: Application
    Filed: October 16, 2020
    Publication date: April 21, 2022
    Applicant: Seagate Technology LLC
    Inventors: Riyan Mendonsa, Brett Herdendorf, Krishnan Subramanian, Jon Trantham
  • Disk drive controller incorporating task manager for reducing performance spikes
    Patent number: 11307805
    Abstract: A disk drive comprises non-volatile rotatable media and a controller operatively coupled to the non-volatile rotatable media. The controller is configured to receive a series of host commands to be executed by the controller and generate a command execution sequence comprising the series of host commands. A task manager, integral or coupled to the controller, is configured to receive a plurality of background tasks comprising a least two priority background tasks to be executed by the controller along with execution of the series of host commands, and insert one or more of the at least two priority background tasks into the command execution sequence while maintaining a specified ratio of priority background task execution and host command execution substantially constant. The controller is configured to execute the command execution sequence with the one or more inserted priority background tasks.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Jin Quan Shen
  • Distributed secure edge storage network utilizing redundant heterogeneous storage
    Patent number: 11308041
    Abstract: N storage nodes that are coupled via a network are selected to store a file of size |F| and redundancy of size |Fred|. A value Z<N is selected such that an attacker having access to Z storage nodes is unable to decode any partial information of the file. The file is divided into d partitions of size |PsN|, wherein |PsN| is a maximum factor of |F| subject to |PsN|?|sN|. Independent linear combinations hi's of the d partitions are created and random keys are generated and stored in the first Z of the N storage nodes. Independent linear combinations gi's of the random keys are created and combinations of the hi's and gi's are stored in the Z+1 to Nth storage nodes.
    Type: Grant
    Filed: October 31, 2019
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Yasaman Keshtkarjahromi, Mehmet Fatih Erden
  • Top cover spring designs
    Patent number: 11308994
    Abstract: A hard disk drive includes a base, a cover coupled to the base to create an enclosure, and a voice coil motor assembly that is positioned within the enclosure. The cover includes a spring positioned adjacent to the voice coil motor assembly to dampen vibration of the voice coil motor assembly.
    Type: Grant
    Filed: April 20, 2020
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Pow Ming Yap, Tai Zen Tan, Siew Ming Ng, Hui Khim Cho, Swee How Alvin Teo
  • Curved outer gimbal strut
    Patent number: 11308982
    Abstract: A head gimbal assembly for supporting a disk drive includes a slider, a load beam, a ring gimbal affixed to the load beam, and a flexure. The gimbal includes a curved outer gimbal strut comprising a protrusion located between a first straight section of the curved outer gimbal strut and a second straight section of the curved outer gimbal strut. The flexure includes a first end extending along the load beam through a center region of a longitudinal axis of the head gimbal assembly and second end that includes a plurality of bond pads electrically coupled to the slider.
    Type: Grant
    Filed: May 27, 2021
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventor: Mark Pallay
  • Private information retrieval using one query to perform multiple retrievals
    Patent number: 11308081
    Abstract: A method and apparatus for private information retrieval from a database, wherein the retrieval includes providing a covering vector for a plurality of database entries of the database. The covering vector is defined such that an inner product of the covering vector is zero with more than one member of a covering vector family that includes the covering vector. The retrieval includes generating database queries based on the covering vector and transmitting the database queries to at least two servers. An identical copy of the database may be stored on each of the at least two servers. Shares are received in response to the query, and these shares are aggregated, and a reconstruction algorithm executes to reconstruct the query results.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Vipin Singh Sehrawat, Foo Yee Yeo
  • Distributed secure edge storage network utilizing cost function to allocate heterogeneous storage
    Patent number: 11308040
    Abstract: A set of N network-coupled edge storage nodes are selected to store a file of size |F|. The N edge storage nodes have heterogeneous storage availability and are ordered from a largest storage availability at the first edge storage node to a smallest availability at the Nth edge storage node. A value Z<N is selected, such that an attacker having access to Z edge storage nodes is unable to decode any partial information of the file. The first through Z+1th edge storage nodes are assigned a same packet size. Keys are stored in the first Z edge storage nodes and independent linear combinations of the keys combined with partitions of the file are stored in the Z+1th to the Nth edge storage nodes.
    Type: Grant
    Filed: October 31, 2019
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Yasaman Keshtkarjahromi, Mehmet Fatih Erden
  • Logical to physical data storage mapping
    Patent number: 11307997
    Abstract: Systems, methods and computer-readable memory for garbage collection in a storage device. One method comprises, upon a write of data to a first garbage collection unit (GCU) of the storage device, incrementing a number of logical mapping units stored in the first GCU along with a number of logical mapping units with valid data stored in the first GCU. A number of logical mapping units with invalid data stored in a second GCU is decremented based on the incremented number of logical mapping units with valid data stored in the first GCU. The second GCU is erased when a valid data rate of the second GCU is below a valid data rate of the first GCU.
    Type: Grant
    Filed: June 23, 2020
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Hongmei Xie, Zejiang Qu, Hackbin Kim, Erich Franz Haratsch
  • Lapping system that includes a lapping plate temperature control system, and related methods
    Patent number: 11305397
    Abstract: The present disclosure includes a lapping system that includes a temperature control system system to heat or cool the lapping plate while lapping. The temperature control system can include a closed circuit fluid system and/or one or more electrical resistive heating elements. In some embodiments that cooling system can control the temperature of the lapping plate during lapping to within +/?5° C., or even +/?0.5° C.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Andrew Habermas, Dat Quach, Jeff O'Konski, Yuhong Xiong, Ricky Anderson, Joshua Zierhut
  • Selectively routing signals to data storage devices within a data storage system that includes a movable carriage
    Patent number: 11308990
    Abstract: An apparatus includes a housing, a data storage magazine configured to hold a plurality of data storage devices, and a movable carriage disposed within the housing that is configured to selectively couple the data storage devices to a host device. The data storage magazine includes a set of magazine signal paths configured to provide signals to the plurality of data storage devices. The movable carriage includes a set of carriage signal paths configured to provide signals to the plurality of data storage devices. The apparatus includes a controller configured to power the plurality of data storage devices by selectively routing the signals via the set of magazine signal paths or the set of carriage signal paths.
    Type: Grant
    Filed: October 16, 2020
    Date of Patent: April 19, 2022
    Assignee: Seagate Technology LLC
    Inventors: Riyan Mendonsa, Brett Herdendorf, Krishnan Subramanian, Jon Trantham
  • Customized parameterization of read parameters after a decoding failure for solid state storage devices
    Patent number: 11301323
    Abstract: Read parameter estimation techniques are provided that obtain information from multiple read operations to customize read parameters for data recovery. One method comprises performing the following steps, in response to a decoding failure of a page of a memory or a codeword of the memory: obtaining at least three read values of the page or codeword; and processing the at least three read values to determine read parameters comprising: (i) a log likelihood ratio, and/or (ii) a center read reference voltage, wherein the determination is based on a signal count of a number of bits falling in particular regions of multiple regions of the memory and wherein the determined read parameters are used for a decoding of the page or codeword following the decoding failure and/or a subsequent read operation following a successful decoding of the page or codeword.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: April 12, 2022
    Assignee: Seagate Technology LLC
    Inventors: Zheng Wang, Ara Patapoutian, Bengt Anders Ulriksson