Patents Examined by Nabil Z. Hindi
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Patent number: 12217776Abstract: A method for writing to tape by a tape drive is provided. The method includes, in response to identifying a write error during a write to a tape in a certain HRTD region, repositioning the tape to a next HRTD region. The method further includes continuing the write at the next HRTD region.Type: GrantFiled: January 4, 2024Date of Patent: February 4, 2025Assignee: International Business Machines CorporationInventors: Tsuyoshi Miyamura, Setsuko Masuda
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Patent number: 12211529Abstract: A computer-implemented method for preparing a disk for a disk drive for operation includes: writing first and second servo information in a first portion of a servo sector for a track of the disk; writing third and fourth servo information in a second portion of the servo sector; in a single revolution of the disk, reading a first signal associated with the first servo information, a second signal associated with the second servo information, a third signal associated with the third servo information, and a fourth signal associated with the fourth servo information; based on the first signal, the second signal, the third signal, and the fourth signal, determining a repeatable runout value for the servo sector; and storing the repeatable runout value for the servo sector in a location that is accessed during operation and used during the operation as a repeatable runout correction factor for the track.Type: GrantFiled: August 17, 2023Date of Patent: January 28, 2025Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Gabor Szita, Richard M. Ehrlich
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Patent number: 12211531Abstract: A magnetic recording and reproducing device includes a magnetic recording medium including a protective layer that is exposed to an enclosed interior volume of the magnetic recording and reproducing device, which contains oxygen and helium, a magnetic head including a heat assist element that is also exposed to the enclosed interior volume, the magnetic head configured to record data onto the magnetic recording medium, and an oxygen amount measurement unit configured to measure an oxygen amount in the enclosed interior volume.Type: GrantFiled: August 31, 2023Date of Patent: January 28, 2025Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Masaya Ohtake, Kaori Kimura
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Patent number: 12211530Abstract: According to an embodiment, a controller of a magnetic disk apparatus moves a magnetic head to a first track being one of tracks on a magnetic disk. The controller acquires, in a servo sampling cycle, a positioning error amount of the magnetic head with respect to the first track. The controller executes an access to the first track by the magnetic head after a positioning error amount equal to or less than a first threshold is continuously acquired a first set number of times. The controller obtains a frequency estimation value by estimating a frequency of residual vibration of the magnetic head due to movement of the magnetic head to the first track and obtains an amplitude estimation value by estimating an amplitude of the residual vibration. The controller updates the first set number of times on the basis of the frequency estimation value and the amplitude estimation value.Type: GrantFiled: February 15, 2024Date of Patent: January 28, 2025Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventor: Takeyori Hara
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Patent number: 12211532Abstract: According to one embodiment, a disk device includes a disk-shaped recording medium, a magnetic head including a write head, a read head, and a heater, and a controller including a reference signal generator outputting a reference signal having a constant voltage amplitude at the same frequency as a high-frequency component of a gap measurement signal recorded in the recording medium, a measurer measuring a component amplitude of a reproduced signal of the gap measurement signal and an amplitude of the reference signal, and a heater controller controlling a power value of heater power supplied to the heater based on the measured values of the component amplitude and the amplitude of the reference signal.Type: GrantFiled: August 23, 2023Date of Patent: January 28, 2025Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventor: Toru Watanabe
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Patent number: 12205617Abstract: According to the embodiment, an HDC receives a plurality of data segments from a host, and executes generation and addition of a first code and output of a data segment to which the first code is added to each data segment. An HDC calculates exclusive OR with respect to the first codes, and outputs obtained first information. The RWC performs data conversion and calculation of exclusive OR on the plurality of data segments to which the first code is added, and outputs the plurality of data segments after the data conversion and a track parity obtained by the calculation of the exclusive OR. The RWC acquires the first code from the plurality of data segments. The RWC calculates exclusive OR with respect to a group of the second codes which are the acquired first codes to acquire second information. The RWC compares the first information with the second information.Type: GrantFiled: December 12, 2023Date of Patent: January 21, 2025Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Yosuke Kondo, Syosuke Maruyama
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Patent number: 12198740Abstract: According to one embodiment, a magnetic disk device comprising a magnetic head expanding to the magnetic disk side with the generated heat of a heater, a flying height measurement unit measuring a flying height of the magnetic head, based on a read signal of the magnetic head for data for measuring flying height written to the magnetic disk, and a controller. The controller detects variation of a measurement value of the flying height measurement unit, based on change of “correspondence between a change amount of the supply power and a measurement value of the flying height measurement unit”.Type: GrantFiled: January 24, 2024Date of Patent: January 14, 2025Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventor: Masayuki Kondo
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Patent number: 12198738Abstract: According to one embodiment, a magnetic disk device includes a base having a pedestal, a magnetic disk, an actuator that supports and drives a head, and a ramp that is provided on the pedestal and holds the head in an unloading position. The pedestal has a first face, a first hole provided in the first face, a support sleeve disposed on the first face and coaxial with the screw hole, and a recess provided in the support sleeve. The ramp has a guide face that supports the head, a second face opposing the first face, a second hole opened in the second face and configured to receive the support sleeve, and a protrusion that engages with the recess and regulates a pivoting of the ramp around the support sleeve, and is fixed to the pedestal using a fastener that is passed through the second hold and into the first hole.Type: GrantFiled: February 13, 2024Date of Patent: January 14, 2025Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventor: Masaki Morita
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Patent number: 12190908Abstract: A data storage device may include a media comprising a magnetic recording layer and a heat-assisted magnetic recording (HAMR) head for writing to the magnetic recording layer, the HAMR head comprising: a waveguide, a main pole comprising a main-pole surface facing the magnetic recording layer, a near-field transducer (NFT) situated between the main pole and the waveguide, and a transparent overcoat. The NFT comprises a main body and a micropillar. The micropillar comprises a micropillar surface facing the magnetic recording layer. A first distance between the micropillar surface and the media is less than a second distance between the main-pole surface and the media. The transparent overcoat is situated on the main-pole surface and the micropillar surface.Type: GrantFiled: August 2, 2023Date of Patent: January 7, 2025Assignee: Western Digital Technologies, Inc.Inventors: Sukumar Rajauria, Erhard Schreck, Robert Smith
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Patent number: 12190924Abstract: Various illustrative aspects are directed to a data storage device comprising a disk, a read/write head configured to read data from and write data to the disk, a laser diode (LD) coupled to a nearfield transducer configured to heat an area of the disk near the read/write head, a first resistive temperature detector (RTD), a second RTD, and one or more processing devices configured to: apply a laser bias to the LD during a write operation; obtain a plurality of differential signal measurements, based at least in part on a plurality of measurements from each of the first and second RTDs; and adjust the laser bias applied to the LD, based at least in part on comparing the plurality of differential signal measurements to a target value for the differential signal.Type: GrantFiled: January 15, 2024Date of Patent: January 7, 2025Assignee: Western Digital Technologies, Inc.Inventors: Joey M. Poss, Bernhard E. Knigge
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Patent number: 12190910Abstract: A system for recalling data from tape is disclosed. The system includes computer processing circuits and computer readable storage media having computer executable instructions. When executed, the instructions cause the computer-processing circuits to start, in response to a request to recall data from a tape, to read the tape at a read position. Additionally, the instructions cause the circuits to determine that the tape comprises a damaged region. Further, the instructions cause the circuits to determine a start position of the damaged region by skimming the tape. Additionally, the instructions cause the circuits to determine an end position of the damaged region by skimming the tape. Further, the instructions cause the circuits to read between the read position and the start position of the damaged region. Additionally, the instructions cause the circuits to read between the end position of the damaged region and an end of data indicator.Type: GrantFiled: December 11, 2023Date of Patent: January 7, 2025Assignee: International Business Machines CorporationInventors: Setsuko Masuda, Tsuyoshi Miyamura, Tatsuki Sawada
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Patent number: 12183374Abstract: Disclosed herein is a magnetic storage device that includes magnetic storage discs and a first carriage arm rotatably movable in a radial direction along a first one of the magnetic storage discs and within a region radially outward from the first one of the magnetic discs. The magnetic storage device includes a first suspension arm co-movably fixed to the first carriage arm and having a first-suspension-arm length extending from a proximate first-suspension-arm end of the first suspension arm to a distal first-suspension-arm end of the first suspension arm. The magnetic storage device also includes a second suspension arm co-movably fixed to the first carriage arm and having a second-suspension arm length extending from a proximate second-suspension arm end to a distal second-suspension arm end of the second suspension arm that is different from the first-suspension arm length.Type: GrantFiled: January 11, 2024Date of Patent: December 31, 2024Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Toshihisa Okazaki, Andrew Hanlon, Haruhide Takahashi
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Patent number: 12183375Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, and a controller including an offtrack write table, positioning the magnetic head, and registering an address at which data in a track is written and a positioning error of the magnetic head at the address for the track, in the offtrack write table. When writing data to a first sector, the controller corrects a positioning target position of the first sector, based on a positioning error of a second sector located on two tracks away in a radial direction from the first sector.Type: GrantFiled: January 23, 2024Date of Patent: December 31, 2024Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Takayuki Kawabe, Takeyori Hara
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Patent number: 12183372Abstract: Various illustrative aspects are directed to a data storage device comprising a disk and a read/write head configured to read data from and write data to the disk. The read/write head comprises a write pole tip and a transducer configured near the write pole tip. One or more processing devices are mounted on or near the read/write head and generate an AC current that is applied to the transducer to cause the transducer to generate a high frequency auxiliary field that is applied to the disk. The one or more processing devices may be an RF source IC mounted on or near a slider on which the read/write head is integrated or mounted.Type: GrantFiled: August 10, 2023Date of Patent: December 31, 2024Assignee: Western Digital Technologies, Inc.Inventors: John T. Contreras, Howard Gordon Zolla, Yunfei Ding, Joey M. Poss
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Patent number: 12176002Abstract: According to an embodiment, tracks on a magnetic disk each include a long-distance sector having a length in the circumferential direction covering two or more servo sectors. A controller executes an acquisition operation to acquire one or more evaluation amounts on the basis of a track pitch in each of the two or more servo sectors included in a portion adjacent to the long-distance sector. The controller executes a protection operation to protect data of an adjacent track in a case where a total value of the one or more evaluation amounts exceeds a first threshold value.Type: GrantFiled: December 20, 2023Date of Patent: December 24, 2024Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventor: Nobuhiro Maeto
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Patent number: 12176001Abstract: Improved tools and techniques for configuring a write head of a hard disk drive and/or for writing data to a hard disk drive. The write surface of a disk in the hard disk drive can be divided into multiple logical zones, with different interleave sizes for each zone. This scheme can meet latency requirements for regions closer to the center of the write surface while providing for better error rate performance in regions further away from the center of the write surface.Type: GrantFiled: July 30, 2023Date of Patent: December 24, 2024Assignee: Avago Technologies International Sales Pte. LimitedInventor: Shaohua Yang
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Patent number: 12176015Abstract: A data storage device comprises a disk and a head having a read and write elements. A read heater is powered based on a dual heater ratio (DHR) to thermally adjust a spacing of the read element from a disk surface, and a write heater is powered based on the DHR to thermally adjust a spacing of the write element from the disk surface. A read spacing slope profile is determined comprising read touchdowns (TDs) over a range of DHRs, and a write spacing slope profile is determined comprising write TDs over the range of DHRs. An operating DHR of the head is set to be where the read spacing slope profile intersects the write spacing slope profile.Type: GrantFiled: October 19, 2023Date of Patent: December 24, 2024Assignee: Western Digital Technologies, Inc.Inventors: Bernhard E. Knigge, Qinghua Zeng, Noureddine Kermiche
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Patent number: 12170102Abstract: An apparatus includes a substrate. A laser is deposited above the substrate. The laser includes one or more non-self-supporting layers of crystalline material. The laser has a length along a light path in a range of about 40 um to about 350 um. An optical input coupler is configured to receive light from the laser. A waveguide is deposited proximate the optical input coupler. The waveguide is configured to communicate light from the laser via the optical input coupler to a near-field transducer that directs energy resulting from plasmonic excitation to a recording medium.Type: GrantFiled: September 29, 2023Date of Patent: December 17, 2024Assignee: Seagate Technology LLCInventors: Reyad Mehfuz, Niall Donlon, Aidan Dominic Goggin, Prim Gangmei
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Patent number: 12170435Abstract: A data storage device may include one or more disks, an actuator arm assembly comprising one or more magnetic recording heads, a laser diode positioned inside a laser diode cavity, and one or more processing devices configured to initiate a write operation, wherein initiating the write operation comprises activating a magnetic recording head corresponding to the laser diode, and applying a forward bias to the laser diode; apply a first reverse bias to the laser diode during at least one intervening event; and transition from applying the first reverse bias to the at least one laser diode to applying the forward bias to the at least one laser diode.Type: GrantFiled: August 10, 2023Date of Patent: December 17, 2024Assignee: Western Digital Technologies, Inc.Inventors: Erhard Schreck, Sukumar Rajauria, Robert Smith
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Patent number: 12165674Abstract: Provided are a computer program product, device, system, and method for write data management. In one embodiment, a write management controller calculates an order for writing data and parity blocks of write data code words on tape media in a variable interleaved fashion which ensures a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word. The calculated write order information may be provided back to a host or other data source so that the write data is eventually transmitted to the tape drive for writing on tape media in accordance with the calculated write order. In this manner, a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word may be achieved to increase the reliability of the data storage.Type: GrantFiled: March 4, 2024Date of Patent: December 10, 2024Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Simeon Furrer, Mark Alfred Lantz, Martin Petermann, Ilias Iliadis