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公开(公告)号：US12190908B2
公开(公告)日：2025-01-07
申请号：US18364413
申请日：2023-08-02
Applicant: Western Digital Technologies, Inc.
Inventor： Sukumar Rajauria , Erhard Schreck , Robert Smith
Abstract: 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.
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公开(公告)号：US20230197108A1
公开(公告)日：2023-06-22
申请号：US17557528
申请日：2021-12-21
Applicant: Western Digital Technologies, Inc.
Inventor： Joey M. Poss , Erhard Schreck
IPC: G11B5/027
CPC classification number: G11B5/027
Abstract: Example preamplifier circuits, data storage devices, and methods to provide a preamplifier circuit with separate read and write power channels are described. The preamplifier circuit may include a write driver circuit configured to send a write signal to a writer element of a data storage device and a read driver circuit configured to receive a read signal from a reader element of the data storage device. The write driver circuit may receive a write power signal through a write power channel of a bus interface and the read driver circuit may receive a read power signal through a read power channel of the bus interface, where the write power signal and the read power signal are different. In some configurations, the different read and write power signals may be received from a switching regulator on the printed circuit board that mounts other data storage device electronics, such as the drive controller circuit and/or read/write channel circuit.
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3.发明授权公开(公告)号：US10783913B1
公开(公告)日：2020-09-22
申请号：US16396883
申请日：2019-04-29
Applicant: Western Digital Technologies, Inc.
Inventor： Sukumar Rajauria , Erhard Schreck , Weldon M. Hanson , Yeoungchin Yoon
Abstract: A data storage device is disclosed comprising a head actuated over a disk surface, wherein the head comprises a plurality of elements including a write assist element. A bias signal applied to the write assist element is controlled such that the write assist element is substantially unprotruded, and while the write element is substantially unprotruded, an air bearing resonant frequency (ABRF) of the head and disk surface is measured. The bias signal applied to the write assist element is controlled such that the write assist element protrudes toward the disk surface, and while the write assist element protrudes toward the disk surface, the head is excited at the measured ABRF and the head touching down onto the disk surface is detected.
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公开(公告)号：US10564053B2
公开(公告)日：2020-02-18
申请号：US16229855
申请日：2018-12-21
Applicant: Western Digital Technologies, Inc.
Inventor： John T. Contreras , Lidu Huang , Shen Ren , Erhard Schreck , Rehan Ahmed Zakai
Abstract: Embodiments disclosed herein generally relate to a method for monitoring optical power in a HAMR device. In one embodiment, the method includes enhancing a thermal sensor bandwidth through advanced electrical detection techniques. The advanced electrical detection techniques include obtaining calibration waveform data for a thermal sensor by calibrating the thermal sensor, obtaining real-time waveform data for the thermal sensor that may deviate from the calibration waveform data, updating the calibration waveform data to include the real-time waveform data, repeating obtaining real-time waveform data and updating the calibration waveform data during writing operations. By updating the calibration waveform data, the bandwidth of the thermal sensor is determined by a fixed sampling time interval, and the thermal sensor rise time to steady state would not be a limitation to its response time.
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公开(公告)号：US12230304B2
公开(公告)日：2025-02-18
申请号：US18232003
申请日：2023-08-09
Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.
Inventor： Bernd Lamberts , Bernhard E. Knigge , Erhard Schreck , Qing Dai
Abstract: Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator mechanism configured to position one or more heads proximate to a corresponding disk surface of the one or more disks; and one or more processing devices. The one or more processing devices are configured to receive signals indicative of conditions of a write operation by the selected head. The one or more processing devices are further configured to determine, based on the signals, a verification status indicating whether the write operation was successful. The one or more processing devices are further configured to output the verification status within a selected time limit.
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Patent Agency Ranking
公开(公告)号：US20250007238A1
公开(公告)日：2025-01-02
申请号：US18447552
申请日：2023-08-10
Applicant: Western Digital Technologies, Inc.
Inventor： Sukumar Rajauria , Erhard Schreck
Abstract: A data storage device may include one or more disks, an actuator arm assembly comprising one or more magnetic recording heads, at least one laser diode, and one or more processing devices configured to: set the at least one laser diode to a first temperature; apply a first forward bias and supply a first current to the at least one laser diode such that it is in a lasing state; measure, for the at least one laser diode, a first output corresponding to the first temperature and current; set the at least one laser diode to a second temperature; measure, for the at least one laser diode, a second output corresponding to the second temperature and the first current; and determine an output profile for the at least one laser diode, based at least in part on the respective output at the first temperature and the second temperature.
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公开(公告)号：US12027181B2
公开(公告)日：2024-07-02
申请号：US17824745
申请日：2022-05-25
Applicant: Western Digital Technologies, Inc.
Inventor： Erhard Schreck , Robert Smith
IPC: G11B23/087 , G11B15/32
CPC classification number: G11B23/08728 , G11B15/32 , G11B23/08721 , G11B23/08735 , G11B23/08757
Abstract: The present disclosure generally relate to tape assembly implementations for magnetic recording devices, such as tape embedded drives (TEDs). In one or more embodiments, a first reel and a second reel are mounted at stationary positions. One or more of the first reel and/or the second reel includes a hub mounted to a spindle, and a single flange extending relative to the hub. In one or more embodiments, one or more of a first reel and/or a second reel each includes a flangeless hub mounted to a spindle.
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公开(公告)号：US11934687B2
公开(公告)日：2024-03-19
申请号：US17743386
申请日：2022-05-12
Applicant: Western Digital Technologies, Inc.
Inventor： Erhard Schreck , Sukumar Rajauria , Robert Smith
IPC: G06F3/06
CPC classification number: G06F3/0655 , G06F3/0604 , G06F3/0676
Abstract: The present disclosure generally relates to a multi-disk drive comprising a plurality of media surfaces and a plurality of heads, wherein a head of the plurality of heads is configured to be actuated over each surface of the plurality of media surfaces. The multi-disk drive further comprises control circuitry configured to write data to a first media surface of the plurality of media surfaces using a first head of the plurality of heads, and after all of an available memory of the first media surface has been filled, write data to a second media surface of the plurality of media surfaces using a second head of the plurality of heads. The control circuitry is further configured to permanently disable write access to one or more media surfaces of the plurality of media surfaces, while continuing to permit read access to the plurality of media surfaces.
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公开(公告)号：US11694722B1
公开(公告)日：2023-07-04
申请号：US17651100
申请日：2022-02-15
Applicant: Western Digital Technologies, Inc.
Inventor： Shaomin Xiong , Erhard Schreck , Robert Smith , Sukumar Rajauria
CPC classification number: G11B21/106
Abstract: The present disclosure generally relates to using a data timestamp and/or a read counter to prevent data from being re-read and signal that the data has been accessed. The write assist element in the write head can be utilized to degrade the data or an allocated marker after the data has been read. The degradation functions as a read counter to indicate how many times the data has been read. Additionally and/or alternatively, a timestamp can be utilized. The timestamp is updated each time that the data has been accessed. In so doing, it is possible to determine whether data in a data storage device has been accessed.
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10.发明授权公开(公告)号：US10910007B1
公开(公告)日：2021-02-02
申请号：US16791238
申请日：2020-02-14
Applicant: Western Digital Technologies, Inc.
Inventor： Tan Trinh , Sukumar Rajauria , Yuichi Aoki , Kosuke Nagase , Erhard Schreck , Qing Dai
Abstract: A heat-assisted magnetic recording (HAMR) hard disk drive has a gas-bearing slider supporting a near-field transducer (NFT) and a NFT temperature sensor (NTS). An optional first IVC circuitry may provide a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a negative bias voltage to the NTS (and the connected NFT) relative to the disk to minimize the adverse effects of excessive heating on the NFT.
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