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11.发明申请公开(公告)号：US20180330754A1
公开(公告)日：2018-11-15
申请号：US15594812
申请日：2017-05-15
Applicant: Seagate Technology LLC
Inventor： Riyan Mendonsa , Jon D. Trantham , James Dillon Kiely , Peng Li , Joshua Ward Christensen
CPC classification number: G11B13/045 , G11B5/6088 , G11B7/126 , G11B13/08 , G11B20/1816 , G11B2005/0021
Abstract: An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.
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12.发明授权公开(公告)号：US10037779B1
公开(公告)日：2018-07-31
申请号：US15798588
申请日：2017-10-31
Applicant: Seagate Technology LLC
Inventor： Riyan Mendonsa , Jason Bryce Gadbois , Mark Allen Gaertner , Guy T. Lawrence , Bruce Douglas Buch
CPC classification number: G11B21/08 , G11B5/012 , G11B2220/20
Abstract: One or more magnetic recording disks are coupled to a spindle motor, each of the disks having opposing recording surfaces. Two or more actuators are moveable independently over at least a first recording surface of the one or more disks. A first actuator of the two or more actuators comprises a first write head and a first read head. A second actuator of the two or more actuators comprises at least a second read head and may include a second write head. A controller is coupled to the two or more actuators and configured to write data to a track on the first recording surface using the first write head, and perform a read operation on the data written to the track using the second read head. The controller is also configured to verify that the data was successfully written to the track in response to the read operation. The read operation can be performed within less than one revolution of the first recording surface after the write operation.
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公开(公告)号：US09830944B1
公开(公告)日：2017-11-28
申请号：US15040692
申请日：2016-02-10
Applicant: Seagate Technology LLC
Inventor： Riyan Mendonsa , Christopher J. Rea , Stephanie Hernandez
CPC classification number: G11B5/6011 , G11B5/012 , G11B5/6088 , G11B7/126 , G11B11/105 , G11B11/10595 , G11B2005/0021
Abstract: First and second nominal head-to-media spacings of a magnetic recording head are determined that result in tracks being written to a magnetic recording medium at respective narrower and wider tracks widths. Three or more adjacent tracks of user data are written to the magnetic recording medium using one of the first and second nominal head-to-media spacings so that the adjacent tracks alternate between the narrower and wider track widths.
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公开(公告)号：US09792939B2
公开(公告)日：2017-10-17
申请号：US14276504
申请日：2014-05-13
Applicant: Seagate Technology LLC
Inventor： Riyan Mendonsa , Puskal Prasad Pokharel
CPC classification number: G11B5/59655 , G11B5/09 , G11B5/5526 , G11B5/5543 , G11B5/59627 , G11B11/10578 , G11B17/0402
Abstract: At least a portion of a first servo mark is read using a first read head during a rotation of a disk, the rotation comprising no more than 360 degrees. At least a portion of a second servo mark is read using a second read head during the rotation of the disk. Tracking positions of the first read head and the second read head are determined during the rotation based on reading the first servo mark and the second servo mark.
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15.发明授权公开(公告)号：US09390738B1
公开(公告)日：2016-07-12
申请号：US14723802
申请日：2015-05-28
Applicant: Seagate Technology LLC
Inventor： Riyan Mendonsa , Douglas A. Saunders , Pu-Ling Lu , James H. McGlennen
CPC classification number: G11B5/4866 , G11B5/012 , G11B5/02 , G11B5/1871 , G11B5/3116 , G11B5/314 , G11B5/483 , G11B5/4873 , G11B5/4886 , G11B5/6088 , G11B7/1387 , G11B13/08 , G11B2005/0021
Abstract: Bits are written to a track of a heat-assisted magnetic recording medium via a write transducer at a first skew angle. The track is read via a read transducer oriented at a second skew angle different from the first skew angle. The second skew angle causes the read transducer be more closely aligned with boundaries of the bits than if oriented at the first skew angle.
Abstract translation: 通过写入传感器以第一歪斜角将位写入热辅助磁记录介质的轨迹。 通过以与第一倾斜角度不同的第二倾斜角度定向的读取传感器读取轨道。 第二偏斜角度使得读取换能器与位于第一偏斜角的方向相比更接近于比特边界。
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Patent Agency Ranking
16.发明申请PROCESSING SERVO DATA FROM TWO OR MORE READ TRANSDUCERS CO-LOCATED ON A SLIDER 审中-公开从两个或更多读取传感器处理服务器数据，位于滑动器上公开(公告)号：US20150356988A1
公开(公告)日：2015-12-10
申请号：US14803274
申请日：2015-07-20
Applicant: Seagate Technology LLC
Inventor： Puskal Prasad Pokharel , Riyan Mendonsa
CPC classification number: G11B5/59688 , G11B5/596 , G11B5/59627 , G11B5/6005 , G11B20/10388 , G11B20/1217 , G11B2020/1241
Abstract: Two or more signals are read from two or more respective tracks of a disk drive recording medium using respective two or more read transducers co-located on a slider. The slider is aligned to the two or more tracks in response to the correlation between the two or more signals.
Abstract translation: 使用共同位于滑动器上的相应的两个或更多个读取换能器，从盘驱动器记录介质的两个或更多个相应磁道读取两个或更多个信号。 响应于两个或更多个信号之间的相关性，滑块与两个或更多个轨迹对准。
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17.发明授权Correcting position error based on reading first and second user data signals 有权基于读取第一和第二用户数据信号来校正位置误差公开(公告)号：US08953276B1
公开(公告)日：2015-02-10
申请号：US14296716
申请日：2014-06-05
Applicant: Seagate Technology LLC
Inventor： Puskal Prasad Pokharel , Riyan Mendonsa
IPC: G11B21/02
CPC classification number: G11B5/596 , G11B5/012 , G11B5/4886 , G11B5/59627
Abstract: First and second user data signals of respective first and second tracks are simultaneously read from a disk via first and second read transducers co-located on a slider. A position error of the first and second read transducers is corrected based on the first and second user data signals.
Abstract translation: 通过共同位于滑块上的第一和第二读取换能器，从盘中同时读取相应的第一和第二磁道的第一和第二用户数据信号。 基于第一和第二用户数据信号来校正第一和第二读取换能器的位置误差。
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公开(公告)号：US11308990B1
公开(公告)日：2022-04-19
申请号：US17072930
申请日：2020-10-16
Applicant: Seagate Technology LLC
Inventor： Riyan Mendonsa , Brett Herdendorf , Krishnan Subramanian , Jon Trantham
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.
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公开(公告)号：US10366722B1
公开(公告)日：2019-07-30
申请号：US15978432
申请日：2018-05-14
Applicant: Seagate Technology LLC
Inventor： Riyan Mendonsa , James Dillon Kiely , Joshua Ward Christensen , Jon D. Trantham , Chad Robert Barry , Tim Rausch
IPC: G11B11/00 , G11B7/1263 , G11B5/00 , G11B7/1267 , G11B5/60 , G11B7/126
Abstract: An apparatus comprises a laser diode configured to generate modulated light during a write operation in response to receiving modulated current having a mean amplitude that varies or is constant. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A writer heater of the slider is configured to receive power during the write operation having a magnitude that varies or is constant. A sensor is situated on or within the slider. The sensor is configured to produce a sensor signal representative of output optical power of the laser diode. Measuring circuitry is coupled to the sensor and configured to measure a change in the sensor signal indicative of a laser mode hop during the write operation.
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20.发明授权公开(公告)号：US10249339B1
公开(公告)日：2019-04-02
申请号：US16020501
申请日：2018-06-27
Applicant: Seagate Technology LLC
Inventor： Riyan Mendonsa , Jason Bryce Gadbois , Mark Allen Gaertner , Guy T. Lawrence , Bruce Douglas Buch
Abstract: One or more magnetic recording disks are coupled to a spindle motor, each of the disks having opposing recording surfaces. Two or more actuators are moveable independently over at least a first recording surface of the one or more disks. A first actuator of the two or more actuators comprises a first write head and a first read head. A second actuator of the two or more actuators comprises at least a second read head and may include a second write head. A controller is coupled to the two or more actuators and configured to write data to a track on the first recording surface using the first write head, and perform a read operation on the data written to the track using the second read head. The controller is also configured to verify that the data was successfully written to the track in response to the read operation. The read operation can be performed within less than one revolution of the first recording surface after the write operation.
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