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公开(公告)号：US10366719B1
公开(公告)日：2019-07-30
申请号：US15925927
申请日：2018-03-20
Applicant: Seagate Technology LLC
Inventor： Jason W. Riddering , Dustin Mark Cvancara , Kenneth A. Haapala , Eric John McCalla , Wenzhong Zhu , Bin Huang
Abstract: A clearance heater of a write head is engaged with a boosted current that exceeds a steady-state current. The steady-state current causes the write head to maintain a desired clearance over a disk during writing, the boosted current being applied before a start of the writing. The boosted current is monotonically decreased before the start of the writing and the steady-state current is applied to the heater after the start of the writing.
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公开(公告)号：US10068598B2
公开(公告)日：2018-09-04
申请号：US15915520
申请日：2018-03-08
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Reed D. Hanson , Kenneth A. Haapala , Dwight R. Kinney , Xinghui Huang
CPC classification number: G11B5/556 , G11B5/4873 , G11B5/59622
Abstract: Systems and methods for compensating for hysteresis in a disc drive are described. In one embodiment, a method may use an inverse hysteresis model to linearize effects of hysteresis of a microactuator in the disc drive. The hysteresis model may be a Coleman-Hodgdon hysteresis model. The hysteresis of the microactuator may be characterized, and the inverse hysteresis model may be based at least in part on the characterization. The inverse hysteresis model may be used to implement a digital filter. The digital filter may be employed in series with the microactuator to linearize the effects of hysteresis.
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公开(公告)号：US20160049169A1
公开(公告)日：2016-02-18
申请号：US14457733
申请日：2014-08-12
Applicant: Seagate Technology LLC
Inventor： Kenneth A. Haapala , Joshua Christensen
CPC classification number: G11B5/59688 , G11B5/2652 , G11B5/59655 , G11B20/1217 , G11B2020/1281
Abstract: A storage media includes a plurality of servo sectors with embedded servo patterns characterized by one or more servo pattern parameters. Each of the servo sectors has a servo pattern parameter based on a separation between read sensors of a transducer head reading the servo sector.
Abstract translation: 存储介质包括具有由一个或多个伺服模式参数表征的嵌入式伺服模式的多个伺服扇区。 每个伺服扇区具有基于读取伺服扇区的换能器头的读取传感器之间的间隔的伺服模式参数。
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公开(公告)号：US11843692B2
公开(公告)日：2023-12-12
申请号：US16806920
申请日：2020-03-02
Applicant: Seagate Technology LLC
Inventor： Riyan Alex Mendonsa , Saravanan Nagarajan , Kenneth A. Haapala
CPC classification number: H04L9/0825 , G07C9/00182 , G11B15/6835 , G11B33/124 , G11C16/10 , H04L9/0866 , H04L9/0894 , H04L9/3263
Abstract: A secure cartridge-based storage system includes a set of read/write control electronics on a control board adapted to removably couple with each of a plurality of storage cartridges. The read/write control electronics are adapted to transmit a public key to a target storage cartridge in response to a read/write command received from a host device. The target storage cartridge includes and encryption circuit that authenticates the transmitted public key against a stored public key, accesses a locally-stored encryption key responsive to successful authentication of the public key; and utilizes the locally-stored encryption key to encrypt or decrypt data of the read/write command that is in transit between the storage media and the control board.
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公开(公告)号：US09858961B2
公开(公告)日：2018-01-02
申请号：US14724523
申请日：2015-05-28
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Kenneth A. Haapala , Kaizhong Gao , Edward Gage
CPC classification number: G11B20/1217 , G06F12/0238 , G06F2212/1044 , G06F2212/152 , G06F2212/21 , G06F2212/70 , G11B5/012 , G11B5/09 , G11B2020/1238 , G11B2020/1292
Abstract: A storage device includes a multi-reader transducer head with a first reader and a second reader having an effective cross-track separation equal to a multiple of a defined track-pitch of a storage medium of the storage device. The effective cross-track separation may permit for a simultaneous data read of two non-adjacent data tracks.
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Patent Agency Ranking
公开(公告)号：US09761258B2
公开(公告)日：2017-09-12
申请号：US14457733
申请日：2014-08-12
Applicant: Seagate Technology LLC
Inventor： Kenneth A. Haapala , Joshua Christensen
CPC classification number: G11B5/59688 , G11B5/2652 , G11B5/59655 , G11B20/1217 , G11B2020/1281
Abstract: A storage media includes a plurality of servo sectors with embedded servo patterns characterized by one or more servo pattern parameters. Each of the servo sectors has a servo pattern parameter based on a separation between read sensors of a transducer head reading the servo sector.
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公开(公告)号：US09691418B1
公开(公告)日：2017-06-27
申请号：US14977313
申请日：2015-12-21
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Wenzhong Zhu , Kenneth A. Haapala , Bin Huang
CPC classification number: G11B5/59627 , G11B5/012 , G11B5/40 , G11B19/046 , G11B20/18 , G11B27/36 , G11B33/144
Abstract: Systems and methods for determining a relationship between write fault threshold and temperature are described. The systems and methods include measuring an operating temperature of the storage device, determining a current operating temperature of the storage device, determining whether the current operating temperature of the storage device satisfies a temperature threshold, and upon determining the current operating temperature of the storage device satisfies the temperature threshold, modifying a write fault threshold associated with a data track of the storage device.
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公开(公告)号：US10014020B2
公开(公告)日：2018-07-03
申请号：US15591270
申请日：2017-05-10
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Wenzhong Zhu , Kenneth A. Haapala , Bin Huang
CPC classification number: G11B5/59627 , G11B5/012 , G11B5/40 , G11B19/046 , G11B20/18 , G11B27/36 , G11B33/144
Abstract: Systems and methods for determining a relationship between write fault threshold and temperature are described. The systems and methods include measuring an operating temperature of the storage device, determining a current operating temperature of the storage device, determining whether the current operating temperature of the storage device satisfies a temperature threshold, and upon determining the current operating temperature of the storage device satisfies the temperature threshold, modifying a write fault threshold associated with a data track of the storage device.
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公开(公告)号：US09911442B1
公开(公告)日：2018-03-06
申请号：US15360540
申请日：2016-11-23
Applicant: Seagate Technology LLC
Inventor： Evgeny Kharisov , Josiah Natan Wernow , Kenneth A. Haapala , John C. Morris , Raye A. Sosseh
IPC: G11B5/55
CPC classification number: G11B5/5578 , G11B5/5547 , G11B5/5552 , G11B5/5565 , G11B5/5582
Abstract: An apparatus includes a first controller, a second controller, and a coupling compensator. The first controller is configured to generate a first voice coil motor (VCM) control signal in response to a first position error signal. The second controller is configured to generate a second VCM control signal in response to a second position error signal. The coupling compensator is configured to generate a first feedforward correction signal in response to the first VCM control signal. The first feedforward correction signal modifies the second VCM control signal to generate a modified second VCM control signal.
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公开(公告)号：US09818445B2
公开(公告)日：2017-11-14
申请号：US14993694
申请日：2016-01-12
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Mehmet F. Erden , Kenneth A. Haapala , Wei Tian , Edward Gage
IPC: G11B20/12
CPC classification number: G11B20/1217 , G11B5/012 , G11B5/1278 , G11B5/4813 , G11B5/4886 , G11B20/10009 , G11B2020/1238
Abstract: Implementations described and claimed herein includes a storage device comprising a plurality of readers, including a first subset of readers configured to read a first subset of tracks and a second subset of readers configured to read a second subset of tracks, the first subset of tracks being wider than the second subset of tracks. In another implementation, the readers in the first subset of readers are wider than the readers in the second subset of readers. The wider readers may be configured to recover servo information and the narrow readers may be configured to recover data information. The storage devices may include two-dimensional magnetic recording, conventional perpendicular magnetic recording, shingled magnetic recording, multi-sensor magnetic recording, and interlaced magnetic recording.
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