Patents Assigned to Seagate Technology
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Patent number: 11460545Abstract: A device includes a light splitter configured to receive a source light beam from a light source and split the source light beam into separate light beams, each emitted through an outlet. The device also includes resonators, each of which is optically coupled to at least one of the outlets and is configured to steer at least one of the light beams.Type: GrantFiled: December 19, 2019Date of Patent: October 4, 2022Assignee: Seagate Technology LLCInventors: Aditya Jain, Zoran Jandric, Krishnan Subramanian
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Patent number: 11464131Abstract: A system includes a cable management assembly movable between an extended position and a retracted position. The cable management assembly includes a first pair of brackets slidable with respect to each other as the cable management assembly moves between the extended position and the retracted position. The cable management assembly also includes a second pair of brackets slidable with respect to each other as the cable management assembly moves between the extended position and the retracted position. One of the first pair of brackets is pivotably coupled to one of the second pair of brackets.Type: GrantFiled: February 7, 2020Date of Patent: October 4, 2022Assignee: Seagate Technology LLCInventor: Michael J. Russell
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Patent number: 11455250Abstract: An event that indicates unexpected shutdown of a hard disk drive is determined. The hard disk includes first and second controllers that control respective first and second independently-operable actuators. Each of the actuators has one or more heads that access one or more spinning disks of the hard disk drive. While receiving power for the hard disk drive via back-electromotive force of a motor driven by the one or more spinning disks in response to the event, the first and second controllers independently move the respective first and second actuators to safe positions. In response to determining the first and second actuators are in safe positions, write cache data associated with the first and second controllers is written to a non-volatile memory.Type: GrantFiled: July 2, 2019Date of Patent: September 27, 2022Assignee: Seagate Technology LLCInventors: Bryce L. DeClercq, Steven Faulhaber, Christopher L. Hill, David P. Bremer, Steven Jerome Spaulding
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Patent number: 11456011Abstract: An apparatus comprises a slider configured to facilitate heat assisted magnetic recording and a submount affixed to the slider. A laser unit is affixed to the submount and comprises a laser operable in a non-lasing state and a lasing state. A heater is embedded in the laser unit or the submount. The heater is configured to generate preheat for heating the laser during the non-lasing state and to generate steering heat for heating the laser during the lasing state.Type: GrantFiled: August 20, 2021Date of Patent: September 27, 2022Assignee: Seagate Technology LLCInventors: James Gary Wessel, Roger L. Hipwell, Jr.
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Recessed hardmask used to form heat-assisted magnetic recording near-field transducer with heat sink
Patent number: 11456008Abstract: A method involves depositing a near-field transducer on a substrate of a slider. The near-field transducer comprises a plate-like enlarged portion and a peg portion. A first hard stop extending from the near field transducer and an air bearing surface is formed. A heat sink is formed on the enlarged portion and the first hard stop. A dielectric material is deposited over the near-field transducer and the heat sink. A second hard stop is deposited on the dielectric material away from the air bearing surface. The second hard stop comprises a recess corresponding in size and location to the heat sink. The method involves milling at an oblique angle to the substrate between the first hard stop and second hard stop to cut through the heat sink at the angle. The recess of the second hard stop increases a milling rate over the heat sink compared to a second milling rate of the dielectric away from the heat sink.Type: GrantFiled: March 4, 2019Date of Patent: September 27, 2022Assignee: Seagate Technology LLCInventors: Anusha Natarajarathinam, Yongjun Zhao, Hui Brickner, Dongsung Hong -
Patent number: 11449252Abstract: A method includes the steps of storing non-header data into a plurality of logical pages (“Lpages”) of a non-volatile memory (“NVM”), each Lpage including a number of read units, wherein at least one of the read units is a spanning read unit that spans Lpage boundaries and includes a first byte of at least one Lpage starting in the read unit, storing, in each of the at least one spanning read units that include the first byte of the at least one Lpage starting in the read unit, an Lpage identification header per each of the at least one Lpages starting in the spanning read unit, each Lpage identification header identifying a location of the first byte of the respective Lpage starting within the respective spanning read unit, and locating an Lpage of data stored in the NVM by referring to an entry stored a flash memory controller map table.Type: GrantFiled: July 8, 2020Date of Patent: September 20, 2022Assignee: Seagate Technology LLCInventor: Earl T. Cohen
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Patent number: 11450346Abstract: A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current.Type: GrantFiled: January 18, 2021Date of Patent: September 20, 2022Assignee: Seagate Technology LLCInventors: Karim Tatah, Mourad Benakli, James Gary Wessel
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Patent number: 11449265Abstract: Partitions of drives are used to form a volume of a drive array. Each partition is associated with a trusted computing group (TCG) band. Each drive encrypts data stored on the partition with a key unique to the TCG band. The volume is formed using the partitions of the drives. In response to a band-based erasure being invoked on the volume, each drive of the plurality of drives overwrites the key of the TCG band associated with the partition and provides an erasure certificate attesting to the overwriting of the key. The erasure certifications from the drives are compiled into a consolidated erasure certification that attests to the erasure of the volume.Type: GrantFiled: October 30, 2020Date of Patent: September 20, 2022Assignee: Seagate Technology LLCInventors: Varun Reddy Boddu, Siew Lian Tay
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Patent number: 11450341Abstract: An apparatus comprises a write pole for writing data to a magnetic recording medium and a near-field transducer (NFT) optically coupled to a laser source and configured to produce a thermal spot on the medium. A laser driver applies laser operation power (Iop) to the laser source. A channel circuit generates symbols having a length of nT, where T is a channel clock rate and n is an integer. The laser driver applies Iop to the laser source and a write driver applies bi-directional write currents to the write pole to record the symbols at a location of the thermal spot on the medium, wherein a duration of applying Iop to the laser source by the laser driver is dependent on a length of the symbols and the effective thermal spot size.Type: GrantFiled: August 20, 2021Date of Patent: September 20, 2022Assignee: Seagate Technology LLCInventors: Xiong Liu, Quan Li
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Patent number: 11443765Abstract: A write head includes an input coupler configured to receive light excited by a light source. A waveguide core is configured to receive light from the input coupler at a fundamental transverse electric (TE00) mode. The waveguide core has a first straight portion. The waveguide core has a mode converter portion comprising a branched portion extending from the first straight portion. The mode converter portion is configured to convert the light to a higher-order (TE10) mode, the mode converter portion spaced apart from the input coupler. The waveguide core has a second straight portion between the mode converter portion and a media-facing surface. The write head has a near-field transducer at the media-facing surface, the near-field transducer receiving the light at the TE10 mode from the waveguide and directing surface plasmons to a recording medium in response thereto.Type: GrantFiled: April 5, 2021Date of Patent: September 13, 2022Assignee: Seagate Technology LLCInventors: Reyad Mehfuz, Aidan Dominic Goggin, Pierre Asselin, Christopher Neil Harvey
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Patent number: 11443764Abstract: An apparatus includes a slider configured for heat-assisted magnetic recording. The slider includes an input coupler configured to receive light excited by a light source. The slider includes a waveguide core tapering along a light propagation direction from a first cross-sectional width to a second cross-sectional width, the waveguide configured to provide a surface plasmon-enhanced near-field radiation pattern proximate an output end in response to the received light. One or more cladding layers surround the waveguide core. At least one strip of plasmonic material is disposed between the waveguide core and at least one of the one or more cladding layers.Type: GrantFiled: March 4, 2019Date of Patent: September 13, 2022Assignee: Seagate Technology LLCInventors: Choon How Gan, Mark Anthony Gubbins, Beverley Rutherford McConnell, Martin Peter McCurry, Michael James Hardy, Andres David Barbosa Neira, Fadi El Hallak, Anil Kumar Puri
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Patent number: 11443826Abstract: Systems and methods presented herein provide for testing degradation in a storage device. In one embodiment, a storage controller is operable to test individual portions of a first of the plurality of storage areas of the storage device by: analyzing individual portions of the first storage area; determining that one or more of the individual portions of the first storage area have failed; and retire the failed one or more portions of the first storage area. The storage controller is further operable to write to the first storage area using an error correction code (ECC), and to test the remaining portions of the first storage area to determine whether the first storage area should be retired in response to writing to the first storage area.Type: GrantFiled: May 26, 2020Date of Patent: September 13, 2022Assignee: Seagate Technology LLCInventors: Ludovic Danjean, Abdelhakim Alhussien, Erich Franz Haratsch
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Patent number: 11442715Abstract: A framework, method, and system for generating asynchronous code from state machines coded in a synchronous manner are described. The code is pre-processed into asynchronous code based on the framework prior to compilation thereof. The framework may include various structures and functions such as a save structure, a reentry function, a block wrapping function and a yield identification function.Type: GrantFiled: June 29, 2020Date of Patent: September 13, 2022Assignee: Seagate Technology LLCInventor: Anatolii Bilenko
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Patent number: 11437071Abstract: A method for testing a multiple-actuator storage device includes accessing a first storage device comprising at least a first and a second logical unit and concurrently performing a first group of test operations on the first logical unit and a second group of test operations on the second logical unit. The method includes monitoring for an interruption during the performing the group of test operations on the first or the second logical unit, and during the monitoring, if it is determined that there is an interruption on one of the first or second logical units, performing the respective test operations on the other logical unit is temporarily suspended. The method also includes continuing to monitor for the interruption, and upon determining that the interruption is not currently active, resuming concurrently performing the test operations on the first and second logical units.Type: GrantFiled: August 26, 2019Date of Patent: September 6, 2022Assignee: Seagate Technology LLCInventors: Fabian Tang Kok Meng, Zhixing Chen, Song Liqin
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Patent number: 11436151Abstract: A method includes receiving a request for a cache operation at a first storage device and identifying at least a first input/output operation at a first data block at the first storage device, the first data block having a corresponding first data range. The method also includes identifying a second input/output operation at a second data block having a corresponding second data range and initiating a read operation at the first storage device that comprises the first data block and the second data block. The method further includes combining the first data block and the second data block into a first data volume and writing the first data volume to a second storage device as a third input/output operation.Type: GrantFiled: August 29, 2018Date of Patent: September 6, 2022Assignee: Seagate Technology LLCInventor: Gomathirajan Authoor Velayuthaperumal
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Patent number: 11437068Abstract: A recording head includes an external cavity laser with an externally mounted part having an active region. The external cavity laser also includes a channel waveguide that delivers light towards a media-facing surface. A near-field transducer functions as a reflector, either alone or in combination with a Bragg grating in the channel waveguide. A reflective back facet of the externally mounted part and the reflector define a resonator of the external cavity laser.Type: GrantFiled: July 30, 2020Date of Patent: September 6, 2022Assignee: Seagate Technology LLCInventors: Vivek Krishnamurthy, Scott Eugene Olson, Tyler Lenn Perry, John Charles Duda
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Patent number: 11429587Abstract: Systems and methods are disclosed for multiple duration deduplication entries. A processor may be configured to perform data deduplication operations, including setting a first indicator for first metadata stored to a hash database identifying a first time interval to maintain the first metadata in the database, and setting a second indicator for second metadata stored to the database identifying a second time interval to maintain the second metadata in the database longer than the first time interval. The processor may remove the first metadata from the database when no duplicative data is detected for the first metadata within the first time interval, and remove the second metadata from the database when no duplicative data is detected for the second metadata within the second time interval.Type: GrantFiled: June 29, 2017Date of Patent: August 30, 2022Assignee: Seagate Technology LLCInventors: Michael Barrell, Ian Davies, Kenneth F Day, III, Douglas Dewey
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Patent number: 11429315Abstract: Systems and methods are disclosed for command status polling at a flash queue of a non-volatile memory device. The flash queue may be configured to perform polling on the status of flash operations without direct oversight from the data storage controller or firmware. In certain embodiments, a flash queue circuit may be configured to receive, from a data storage controller of a nonvolatile solid state memory (NVSSM) data storage device, one or more commands to access a flash memory of the NVSSM data storage device, each command of the one or more commands including one or more instructions. The flash queue circuit may execute the one or more commands to access the flash memory, evaluate a status response from the flash memory at the flash queue circuit, and re-execute a sequence of instructions of the one or more commands based on the status response.Type: GrantFiled: September 10, 2020Date of Patent: August 30, 2022Assignee: Seagate Technology LLCInventors: Jeffrey John Pream, Jeremy Blair Goolsby
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Patent number: 11430471Abstract: A disk drive is operable to determine degradation associated with writing to a disk surface by a head which has written existing data at a first areal density. A second areal density less than the first areal density is determined that remediates the degradation. The disk drive performs subsequent writes to the disk surface at the second areal density, and continues to read the existing data at the first areal density.Type: GrantFiled: December 18, 2020Date of Patent: August 30, 2022Assignee: Seagate TechnologyInventors: Drew Allen Cheney, Edward Charles Gage, Praveen Viraraghavan
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Patent number: 11430529Abstract: A method for capacitance coupling parameter estimation includes determining a plurality of mean voltages among a plurality of memory cells of the memory in each of a plurality of cases related to inter-cell interference, generating a plurality of middle state mean voltages in response to the mean voltages, and adjusting one or more threshold voltages used to read from the memory based on the middle state mean voltages to operate independently of knowledge of middle state distributions in the memory cells.Type: GrantFiled: February 23, 2018Date of Patent: August 30, 2022Assignee: Seagate Technology LLCInventors: Meysam Asadi, Zhengang Chen, Erich F. Haratsch
