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公开(公告)号：US09978401B1
公开(公告)日：2018-05-22
申请号：US15497473
申请日：2017-04-26
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Kirill A. Rivkin , Mourad Benakli , Todd M. Lammers , Ralph William Cross
CPC classification number: G11B5/09 , G11B5/012 , G11B20/10009 , G11B20/10018
Abstract: Systems and methods for a providing a chirped current profile with an undershoot for a channel preamplifier are described. A method for writing bits in a magnetic recording disc may include applying an overshoot to a write current which is supplied to a magnetic writer of the magnetic recording disc and applying an undershoot to the write current after the overshoot is applied to at least partially de-saturate the magnetic writer. The method may also include writing a bit to the magnetic recording disc with the magnetic writer using the supplied write current. In some examples, the application of a short negative pulse after an overshoot portion of the write current waveform is delivered to the head during a write operation that writes the bit to the magnetic recording disc.
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2.发明授权Repeated runout (RRO) compensation for alternating tracks in an interlaced magnetic recording system 有权在隔行磁记录系统中交替轨迹的重复跳动（RRO）补偿公开(公告)号：US09508370B1
公开(公告)日：2016-11-29
申请号：US15165492
申请日：2016-05-26
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Peter S. Harllee , Ralph William Cross , Kenneth A. Haapala , Edward Charles Gage
IPC: G11B5/596
CPC classification number: G11B5/59627
Abstract: Method and apparatus for controlling the position of a control object in a closed loop control system, such as a servo control system used in a data storage device. In some embodiments, spaced apart first and second data tracks are written to a rotatable data recording medium without using repeated runout (RRO) compensation values to correct for RRO error in servo data written to the medium. A third data track is subsequently written so as to be interspersed between and partially overlap the first and second data tracks. The third data track is written using a set of RRO compensation values to correct for the RRO error in the servo data.
Abstract translation: 用于控制诸如在数据存储装置中使用的伺服控制系统的闭环控制系统中的控制对象的位置的方法和装置。 在一些实施例中，将间隔开的第一和第二数据磁道写入可旋转的数据记录介质，而不使用重复的跳动（RRO）补偿值来校正写入介质的伺服数据中的RRO误差。 随后写入第三数据磁道，以便分散在第一和第二数据磁道之间并部分重叠。 使用一组RRO补偿值来写入第三条数据轨道，以校正伺服数据中的RRO错误。
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3.发明申请公开(公告)号：US20190341075A1
公开(公告)日：2019-11-07
申请号：US16221839
申请日：2018-12-17
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Quan Li , Ralph William Cross
Abstract: A sequence of symbols is generated to describe a set of write data, the symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. Bi-directional write currents are applied to a write pole to record the sequence of symbols to a magnetic storage medium. The write pole has an effective footprint with a downtrack length of mT, where m is an integer. The write currents are switched between a first rail current and a second rail current for alternating symbols, the write currents further transitioning to an intermediate current value for at least one channel clock period for symbols longer than 1T. Write currents are applied to the write pole when recording symbols having a length longer than mT using the effective footprint of the write pole as an interval.
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4.发明授权公开(公告)号：US10446184B1
公开(公告)日：2019-10-15
申请号：US16221839
申请日：2018-12-17
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Quan Li , Ralph William Cross
Abstract: A sequence of symbols is generated to describe a set of write data, the symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. Bi-directional write currents are applied to a write pole to record the sequence of symbols to a magnetic storage medium. The write pole has an effective footprint with a downtrack length of mT, where m is an integer. The write currents are switched between a first rail current and a second rail current for alternating symbols, the write currents further transitioning to an intermediate current value for at least one channel clock period for symbols longer than 1T. Write currents are applied to the write pole when recording symbols having a length longer than mT using the effective footprint of the write pole as an interval.
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Patent Agency Ranking
公开(公告)号：US10210887B1
公开(公告)日：2019-02-19
申请号：US15956901
申请日：2018-04-19
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Kirill A. Rivkin , Mourad Benakli , Todd M. Lammers , Ralph William Cross
Abstract: Systems and methods for a providing a chirped current profile with an undershoot for a channel preamplifier are described. A method for writing bits in a magnetic recording disc may include applying an overshoot to a write current which is supplied to a magnetic writer of the magnetic recording disc and applying an undershoot to the write current after the overshoot is applied to at least partially de-saturate the magnetic writer. The method may also include writing a bit to the magnetic recording disc with the magnetic writer using the supplied write current. In some examples, the application of a short negative pulse after an overshoot portion of the write current waveform is delivered to the head during a write operation that writes the bit to the magnetic recording disc.
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6.发明授权Requirement relaxation for multiple readers in presence of large skew angle range 有权存在大偏斜角度范围的多位读者需要放松公开(公告)号：US09123384B2
公开(公告)日：2015-09-01
申请号：US14665150
申请日：2015-03-23
Applicant: Seagate Technology LLC
Inventor： Mehmet Fatih Erden , Scott Warmka , Barmeshwar Vikramaditya , Ralph William Cross
CPC classification number: G11B20/10388 , G11B5/012 , G11B5/09 , G11B20/10305
Abstract: A readback signal from a first reader and a readback signal from a second reader are received, the first reader and the second reader configured to read two-dimensional data from at least one track of a recording media. A quality metric of the second reader is measured based on the readback signal. It is determined if the quality metric for the second reader is above a threshold. If the quality metric is above the threshold, the first reader and the second reader are used to read the data.
Abstract translation: 接收来自第一读取器的回读信号和来自第二读取器的回读信号，第一读取器和第二读取器被配置为从记录介质的至少一个轨道读取二维数据。 基于回读信号测量第二读取器的质量度量。 确定第二读取器的质量度量是否高于阈值。 如果质量度量高于阈值，则使用第一读取器和第二读取器来读取数据。
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7.发明授权公开(公告)号：US10192580B1
公开(公告)日：2019-01-29
申请号：US15971284
申请日：2018-05-04
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Quan Li , Ralph William Cross
IPC: G11B15/02 , G11B11/105 , G11B20/10 , G11B5/09 , G11B5/012
Abstract: A sequence of symbols is generated to describe a set of write data, the symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. Bi-directional write currents are applied to a write pole to record the sequence of symbols to a magnetic storage medium. The write pole has an effective footprint with a downtrack length of mT, where m is an integer. The write currents are switched between a first rail current and a second rail current for alternating symbols, the write currents further transitioning to an intermediate current value for at least one channel clock period for symbols longer than 1T. Write currents are applied to the write pole when recording symbols having a length longer than mT using the effective footprint of the write pole as an interval.
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8.发明申请DESIGN REQUIREMENT RELAXATION FOR MULTIPLE READERS IN PRESENCE OF LARGE SKEW ANGLE RANGE 审中-公开设计要求在大角度范围内存在多个读者的放松公开(公告)号：US20150194182A1
公开(公告)日：2015-07-09
申请号：US14665150
申请日：2015-03-23
Applicant: Seagate Technology LLC
Inventor： Mehmet Fatih Erden , Scott Warmka , Barmeshwar Vikramaditya , Ralph William Cross
IPC: G11B20/10
CPC classification number: G11B20/10388 , G11B5/012 , G11B5/09 , G11B20/10305
Abstract: A readback signal from a first reader and a readback signal from a second reader are received, the first reader and the second reader configured to read two-dimensional data from at least one track of a recording media. A quality metric of the second reader is measured based on the readback signal. It is determined if the quality metric for the second reader is above a threshold. If the quality metric is above the threshold, the first reader and the second reader are used to read the data.
Abstract translation: 接收来自第一读取器的回读信号和来自第二读取器的回读信号，第一读取器和第二读取器被配置为从记录介质的至少一个轨道读取二维数据。 基于回读信号测量第二读取器的质量度量。 确定第二读取器的质量度量是否高于阈值。 如果质量度量高于阈值，则使用第一读取器和第二读取器来读取数据。
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公开(公告)号：US08988802B1
公开(公告)日：2015-03-24
申请号：US14100527
申请日：2013-12-09
Applicant: Seagate Technology LLC
Inventor： Mehmet Fatih Erden , Scott Warmka , Barmeshwar Vikramaditya , Ralph William Cross
CPC classification number: G11B20/10388 , G11B5/012 , G11B5/09 , G11B20/10305
Abstract: A readback signal from a first reader and a readback signal from a second reader are received, the first reader and the second reader configured to read two-dimensional data from at least one track of a recording media. A quality metric of the second reader is measured based on the readback signal. It is determined if the quality metric for the second reader is above a threshold. If the quality metric is above the threshold, the first reader and the second reader are used to read the data.
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