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公开(公告)号：US09117471B1
公开(公告)日：2015-08-25
申请号：US14577400
申请日：2014-12-19
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Mingzhong Ding , KianKeong Ooi , Hoang Dung Vu , Chan Fan Lau , Xiang Lu
CPC classification number: G11B5/56 , G11B5/59627
Abstract: An apparatus includes a controller configured to be coupled to a read/write head. The controller is configured to perform various operations including detecting a change in a time interval difference between servo sectors of a servo marked recording medium, converting the change to an offset signal that compensates for the change, and positioning the read/write head relative to the servo mark recording medium in response to the offset signal. The change in the time interval difference is representative of disk slip.
Abstract translation: 一种装置包括被配置为耦合到读/写头的控制器。 控制器被配置为执行各种操作，包括检测伺服标记的记录介质的伺服扇区之间的时间间隔差的变化，将改变转换为补偿变化的偏移信号，以及将读/写头相对于 响应于偏移信号的伺服标记记录介质。 时间间隔差异的变化代表了磁盘滑移。
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公开(公告)号：US10068600B2
公开(公告)日：2018-09-04
申请号：US15727399
申请日：2017-10-06
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Mingzhong Ding , Xiong Liu , Xiang Lu , Qiang Bi , Kian Keong Ooi
IPC: G11B5/596
Abstract: Systems and methods for compensating for magnetoresistive (MR) jog offset direct current (DC) drift in a disc drive are described. In one embodiment, a method may include determining an occurrence of NOS, for example, by monitoring disc slip, to determine when the method should proceed. An MR jog offset DC drift amount is determined for each head of the disc drive. One of several approaches may be employed for determining the MR jog offset DC drift amount. By determining an MR jog offset DC drift amount for each head, a compensation profile is determined for the drive. The determined compensation profile may then be used during operation of the disc drive to compensate for the DC drift. One of several approaches may be employed for compensating based on the compensation profile.
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公开(公告)号：US09858955B1
公开(公告)日：2018-01-02
申请号：US15231513
申请日：2016-08-08
Applicant: Seagate Technology LLC
Inventor： WenJun Cao , GuoQing Zhang , Xiang Lu , Qiang Bi , MingZhong Ding , Lou Supino
CPC classification number: G11B5/5565 , G11B5/5526 , G11B5/5552
Abstract: An apparatus includes a microactuator controller configured to generate a microactuator control signal, a feedforward microactuator compensator configured to generate a microactuator compensation signal, and a microactuator model filter configured to filter a modified microactuator control signal. The microactuator compensation signal is configured to be injected into the microactuator control signal to generate the modified microactuator control signal. The microactuator model filter generates a filtered modified microactuator control signal and injects the filtered modified microactuator control signal into a position error signal to generate a modified position error signal.
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公开(公告)号：US09520149B1
公开(公告)日：2016-12-13
申请号：US15170859
申请日：2016-06-01
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Mingzhong Ding , Xiong Liu , Xiang Lu , Qiang Bi , Kian Keong Ooi
IPC: G11B5/596
CPC classification number: G11B5/59627 , G11B5/59694
Abstract: Systems and methods for compensating for magnetoresistive (MR) jog offset direct current (DC) drift in a disc drive are described. In one embodiment, a method may include determining an occurrence of NOS, for example, by monitoring disc slip, to determine when the method should proceed. An MR jog offset DC drift amount is determined for each head of the disc drive. One of several approaches may be employed for determining the MR jog offset DC drift amount. By determining an MR jog offset DC drift amount for each head, a compensation profile is determined for the drive. The determined compensation profile may then be used during operation of the disc drive to compensate for the DC drift. One of several approaches may be employed for compensating based on the compensation profile.
Abstract translation: 描述了用于补偿磁盘驱动器中的磁阻（MR）点动偏移直流（DC）漂移的系统和方法。 在一个实施例中，方法可以包括例如通过监视盘滑移来确定NOS的发生，以确定该方法何时进行。 确定磁盘驱动器的每个头部的MR点动偏移DC漂移量。 可以采用几种方法之一来确定MR点动偏移DC漂移量。 通过确定每个磁头的MR点动偏移DC漂移量，确定驱动器的补偿曲线。 然后可以在盘驱动器的操作期间使用所确定的补偿曲线以补偿DC漂移。 可以采用几种方法中的一种来基于补偿曲线进行补偿。
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公开(公告)号：US11783856B2
公开(公告)日：2023-10-10
申请号：US16875303
申请日：2020-05-15
Applicant: Seagate Technology LLC
Inventor： Qiang Bi , Jin Quan Shen , Xiong Liu , Xiang Lu , Hui Wang
IPC: G11B5/55
CPC classification number: G11B5/5582
Abstract: A device includes a servo controller that includes or that is coupled to memory. The memory stores multiple distinct disturbance control schemes. The servo controller is configured to select and implement one of the disturbance control schemes in response to receiving a command from a host. The servo controller can be implemented on a system on a chip.
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Patent Agency Ranking
公开(公告)号：US10049692B1
公开(公告)日：2018-08-14
申请号：US14925126
申请日：2015-10-28
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Lihong Zhang , KianKeong Ooi , Xiang Lu
Abstract: Gain values used by a variable gain amplifier (VGA) to read servo marks of a heat-assisted recording medium are measured. Sector-specific, repeatable gain values that indicate an expected VGA gain at a desired clearance are determined based on the measured gain values. The sector-specific, repeatable gain values are used as input to a closed-loop clearance controller together with measured values of servo VGA gain while writing data to the recording medium.
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公开(公告)号：US20150269081A1
公开(公告)日：2015-09-24
申请号：US14222277
申请日：2014-03-21
Applicant: Seagate Technology LLC
Inventor： JiaHong Shu , Xiang Lu , KianKeong Ooi , Qiang Bi
CPC classification number: G06F12/0868 , G06F3/0619 , G06F3/0656 , G06F3/0676 , G06F2003/0691 , G06F2003/0692 , G06F2212/1032 , G06F2212/202 , G06F2212/21 , G06F2212/224 , G06F2212/281 , G06F2212/313 , G11B5/012 , G11B5/09 , G11B5/59694 , G11B20/10527 , G11B20/1217 , G11B20/1816 , G11B27/00 , G11B27/36
Abstract: Technologies are described herein for temporarily writing data to a buffer zone on a recording medium of a storage device when the device is operating in a vibration condition. A vibration condition is detected in the storage device, and upon detecting the vibration condition, data of a current write operation is written to a buffer zone on a recording medium of the storage device, the buffer zone being configured with a lower areal density of storage than primary storage zones on the recording medium. At a later time, an idle condition may be detected in the device, and upon detecting the idle condition, it may be determined whether the vibration condition exists. If it is determined that the vibration condition no longer exists, the data is transferred from the buffer zone to the primary storage zones on the recording medium.
Abstract translation: 这里描述了当设备在振动条件下操作时将数据临时写入存储设备的记录介质上的缓冲区的技术。 在存储装置中检测到振动条件，并且在检测到振动条件时，将当前写入操作的数据写入存储装置的记录介质上的缓冲区，缓冲区被配置为具有较低的存储区域密度 比记录介质上的主存储区域。 稍后，在设备中可以检测到空闲状态，并且在检测到空闲状态时，可以确定是否存在振动条件。 如果确定振动条件不再存在，则数据从缓冲区传送到记录介质上的主存储区。
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公开(公告)号：US10002630B1
公开(公告)日：2018-06-19
申请号：US15636438
申请日：2017-06-28
Applicant: Seagate Technology LLC
Inventor： Hoang Dung Vu , Xiang Lu , GuoQing Zhang , Chan Fan Lau
CPC classification number: G11B5/59622 , G11B5/5582 , G11B5/59627
Abstract: An apparatus includes a frequency analyzer circuitry, filter circuitry, and voice coil motor (VCM) control circuitry. The frequency analyzer circuitry is configured to detect one or more dominant frequencies of a position error signal (PES). The filter circuitry is configured to identify one or more filters in response to detecting the one or more dominant frequencies, apply the one or more identified filters to at least one of a microactuator control signal and PES, and generate a VCM compensation signal in response to the filtered PES or the microactuator control signal. The VCM control circuitry is configured to generate a VCM control signal in response to the VCM compensation signal.
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公开(公告)号：US20210358519A1
公开(公告)日：2021-11-18
申请号：US16875303
申请日：2020-05-15
Applicant: Seagate Technology LLC
Inventor： Qiang Bi , Jin Quan Shen , Xiong Liu , Xiang Lu , Hui Wang
IPC: G11B5/55
Abstract: A device includes a servo controller that includes or that is coupled to memory. The memory stores multiple distinct disturbance control schemes. The servo controller is configured to select and implement one of the disturbance control schemes in response to receiving a command from a host. The servo controller can be implemented on a system on a chip.
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10.发明授权公开(公告)号：US10204650B1
公开(公告)日：2019-02-12
申请号：US16102238
申请日：2018-08-13
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Lihong Zhang , KianKeong Ooi , Xiang Lu
Abstract: Gain values used by a variable gain amplifier (VGA) to read servo marks of a heat-assisted recording medium are measured. Sector-specific, repeatable gain values that indicate an expected VGA gain at a desired clearance are determined based on the measured gain values. The sector-specific, repeatable gain values are used as input to a closed-loop clearance controller together with measured values of servo VGA gain while writing data to the recording medium.
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