公开(公告)号：US10002624B1

公开(公告)日：2018-06-19

申请号：US15680343

申请日：2017-08-18

申请人： Kabushiki Kaisha Toshiba

发明人： Yoshihiro Amemiya

IPC分类号： G11B5/02 ,  G11B5/09 ,  G11B5/012 ,  G11B5/00

CPC分类号： G11B5/09 ,  G11B5/012 ,  G11B5/02 ,  G11B20/10027 ,  G11B2005/0013 ,  G11B2005/0016 ,  G11B2005/0018

摘要： According to one embodiment, a magnetic disk device includes a disk, a head configured to write data to the disk, and an integrated circuit configured to acquire a detection signal indicative of a first pattern of a first frequency of write data, change a first current of a second pattern of a write current corresponding to the first pattern on the basis of the detection signal, detect a third pattern of a second frequency which is greater than the first frequency from the write data, change a second current of a fourth pattern of the write current corresponding to the third pattern, and output the write current with the changed first current and the changed second current to the head.

公开(公告)号：US08947821B1

公开(公告)日：2015-02-03

申请号：US14334369

申请日：2014-07-17

申请人： International Business Machines Corporation

发明人： Katherine T. Blinick ,  Giovanni Cherubini ,  Robert A. Hutchins ,  Jens Jelitto

IPC分类号： G11B5/03

CPC分类号： G11B5/584 ,  G11B5/5926 ,  G11B20/10 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/1201 ,  G11B2005/0013 ,  G11B2020/1281

摘要： According to one embodiment, a system for processing data includes an equalizer configured to use servo coefficients for processing servo data and data coefficients for processing non-servo data, wherein the equalizer includes a finite impulse response (FIR) filter configured to process data read with a magnetic tape channel using the servo coefficients to generate equalized data, one or more low-pass filters with aggressive frequency characteristics configured to filter the equalized data to output filtered data, the one or more low-pass filters with aggressive frequency characteristics being configured to remove high frequency noise from the equalized data, a peak detector configured to process peaks in a waveform of the filtered data, and at least one servo pattern detector configured to detect a servo pattern in the filtered data. Other systems and methods for processing data are described in more embodiments.

摘要翻译： 根据一个实施例，一种用于处理数据的系统包括均衡器，其被配置为使用用于处理伺服数据的伺服系数和用于处理非伺服数据的数据系数，其中均衡器包括有限脉冲响应（FIR）滤波器，其被配置为处理 使用所述伺服系数产生均衡数据的磁带通道，具有激励频率特性的一个或多个低通滤波器，其被配置为对所述均衡数据进行滤波以输出滤波数据，所述一个或多个具有积极频率特性的低通滤波器被配置为 从均衡数据中去除高频噪声，峰值检测器被配置为处理滤波数据的波形中的峰值，以及配置成检测滤波数据中的伺服模式的至少一个伺服模式检测器。 在更多实施例中描述了用于处理数据的其它系统和方法。

公开(公告)号：US20120194945A1

公开(公告)日：2012-08-02

申请号：US13019518

申请日：2011-02-02

申请人： Kaizhong Gao

发明人： Kaizhong Gao

IPC分类号： G11B5/596

CPC分类号： G11B19/045 ,  G11B5/012 ,  G11B5/596 ,  G11B5/746 ,  G11B20/1879 ,  G11B20/20 ,  G11B2005/0013 ,  G11B2220/2516

摘要： Cross-track deviation of a writer from a predetermined track on a recording medium is detected. A write current is adjusted based on the cross-track deviation of the writer from the predetermined track. The adjusted write current is applied to the writer to compensate for the cross-track deviation of the writer from the predetermined track.

摘要翻译： 检测写入器与记录介质上的预定轨迹的交叉磁道偏离。 基于写入器与预定轨迹的交叉磁道偏差来调整写入电流。 调整后的写入电流被施加到写入器以补偿写入器与预定轨迹的交叉磁道偏离。

公开(公告)号：US07889458B2

公开(公告)日：2011-02-15

申请号：US11598418

申请日：2006-11-13

申请人： Wen-Chien David Hsiao ,  Terence Tin-Lok Lam ,  Changqing Shi

发明人： Wen-Chien David Hsiao ,  Terence Tin-Lok Lam ,  Changqing Shi

IPC分类号： G11B5/31

CPC分类号： G11B5/1278 ,  G11B5/187 ,  G11B2005/0013 ,  G11B2005/0032

摘要： A magnetic write head having a magnetic cross yoke arranged to provide a cross magnetic field in a pole tip region of the magnetic head. The cross field, which is perpendicular to the magnetization of write pole, reduces the switching time of the write field, thereby increasing the speed with which the write head can record data. The write head can be a longitudinal write head or a perpendicular write head. In the case of a perpendicular write, the write head can include a write pole arranged to provide a magnetic write field that emits a magnetic field substantially perpendicular with an Air Bearing Surface (ABS). A magnetic cross yoke is formed having ends that are disposed at opposite sides of the pole tip region of the write pole.

摘要翻译： 一种磁性写头，具有设置成在磁头的磁极尖端区域中提供交叉磁场的磁性交叉磁轭。 与写入磁极的磁化方向垂直的交叉场减少写入场的切换时间，从而提高写入头可以记录数据的速度。 写头可以是纵向写头或垂直写头。 在垂直写入的情况下，写入头可以包括写极，该写极被布置成提供发射与空气轴承表面（ABS）基本垂直的磁场的磁写入场。 形成磁性交叉轭，其端部设置在写入极的极尖区域的相对侧。

公开(公告)号：US20100226032A1

公开(公告)日：2010-09-09

申请号：US12718775

申请日：2010-03-05

申请人： Hiroaki SATO

发明人： Hiroaki SATO

IPC分类号： G11B5/02 ,  G11B27/36

CPC分类号： G11B5/455 ,  G11B5/3136 ,  G11B5/40 ,  G11B5/6005 ,  G11B5/6064 ,  G11B2005/0013

摘要： According to one embodiment, a control device includes a writer, a setting module, a reader, and an Iw sensitivity acquiring module. The writer writes a signal by the magnetic head. The setting module sets an electric parameter to the magnetic head. The reader reads the signal by the magnetic head. The Iw sensitivity acquiring module acquires Iw sensitivity of the magnetic head. The Iw sensitivity acquiring module includes a first acquiring module, a second acquiring module, and an Iw sensitivity calculator. The first acquiring module acquires a predetermined output value related to control of a signal having a predetermined frequency. The second acquiring module acquires a predetermined output value related to control of the signal having the predetermined frequency. The Iw sensitivity calculator calculates the Iw sensitivity of the magnetic head based on the predetermined output values acquired by the first and second acquiring modules.

摘要翻译： 根据一个实施例，控制装置包括写入器，设置模块，读取器和Iw灵敏度获取模块。 写者通过磁头写入一个信号。 设置模块将电参数设置到磁头。 读取器通过磁头读取信号。 Iw灵敏度获取模块获得磁头的Iw灵敏度。 Iw灵敏度获取模块包括第一获取模块，第二获取模块和Iw灵敏度计算器。 第一获取模块获取与具有预定频率的信号的控制相关的预定输出值。 第二获取模块获取与具有预定频率的信号的控制相关的预定输出值。 Iw灵敏度计算器基于由第一和第二获取模块获取的预定输出值计算磁头的Iw灵敏度。

公开(公告)号：US20100085657A1

公开(公告)日：2010-04-08

申请号：US12543845

申请日：2009-08-19

申请人： Kenya Ito ,  Takehiko Hamaguchi

发明人： Kenya Ito ,  Takehiko Hamaguchi

IPC分类号： G11B21/02

CPC分类号： G11B5/012 ,  B82Y10/00 ,  G11B5/1278 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B2005/0013

摘要： According to one embodiment, a control method for a magnetic disk device includes writing data by varying a phase of the array period of the plurality of magnetic elements or a phase of the time period of the recording signal in one section of the track from a corresponding phase in another section of the track, reading a reproduction signal from the track, and determining a phase shift between the array period of the plurality of magnetic elements and the time period of the recording signal, based on a reproduction signal read from the one section and a reproduction signal read from the other section. In another embodiment, a magnetic disk includes a track in which magnetic elements are magnetically separated and arranged in an array period, and a phase of the array period in one section is different from a phase in another section of the track.

摘要翻译： 根据一个实施例，一种用于磁盘装置的控制方法包括：通过改变多个磁性元件的阵列周期的相位或从轨道的一个部分中的记录信号的时间段的相位来写入数据 在轨道的另一部分中相位，从轨道读取再现信号，并且基于从一个部分读取的再现信号，确定多个磁性元件的阵列周期与记录信号的时间段之间的相移 以及从另一部分读取的再现信号。 在另一个实施例中，磁盘包括其中磁性元件以阵列周期被磁性地分离和布置的轨道，并且一个部分中的阵列周期的相位不同于轨道的另一部分中的相位。

公开(公告)号：US07428115B2

公开(公告)日：2008-09-23

申请号：US11104011

申请日：2005-04-11

申请人： Takeshi Nakagawa ,  Ikuya Tagawa ,  Atsushi Kikugawa

发明人： Takeshi Nakagawa ,  Ikuya Tagawa ,  Atsushi Kikugawa

IPC分类号： G11B5/02 ,  G11B5/127

CPC分类号： G11B5/012 ,  G11B5/02 ,  G11B5/03 ,  G11B5/09 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/3967 ,  G11B5/4886 ,  G11B2005/0008 ,  G11B2005/001 ,  G11B2005/0013 ,  G11B2005/0016

摘要： Embodiments of the invention provide a countermeasure against spike noise maintaining the data reliability of a magnetic recording layer. In one embodiment, the magnetic domain state right below and around the read head of the soft magnetic layer in the recording medium is locally and temporarily equalized using the write head, whereby, the effect of the spike noise caused by the magnetic domain boundaries (magnetic domain walls) of the soft magnetic layer on the read waveform is prevented. The read retry action of the magnetic hard disk drive is used as the trigger for the timing of the magnetic field application, thereby shortening the time for the magnetic field application.

摘要翻译： 本发明的实施例提供了针对保持磁记录层的数据可靠性的尖峰噪声的对策。 在一个实施例中，在记录介质中的软磁层的读取头的正下方和周围的磁畴状态使用写入头进行局部和临时的均衡，由此，由磁畴边界（磁性）引起的尖峰噪声的影响 可以防止读取波形上的软磁性层的畴壁）。 使用磁性硬盘驱动器的读取重试动作作为磁场施加的定时的触发，从而缩短磁场施加的时间。

公开(公告)号：US07411756B2

公开(公告)日：2008-08-12

申请号：US11052008

申请日：2005-02-04

申请人： Ross Schwensen Wilson ,  Carl F. Elliott

发明人： Ross Schwensen Wilson ,  Carl F. Elliott

IPC分类号： G11B5/03 ,  G11B5/09

CPC分类号： G11B5/465 ,  G11B5/012 ,  G11B2005/0008 ,  G11B2005/0013 ,  G11B2005/0016

摘要： An apparatus and method for demagnetizing a write head of a disc drive. Under control of a clock oscillator, synthetic demagnetizing pulses are generated and applied to a writer-driver bridge. Also under control of the clock oscillator, a write current produced by the writer-driver bridge incorporates the demagnetizing pulses and ramps down to about zero. The train of demagnetizing pulses and the write current ramp down demagnetizes the head, reducing write head magnetic bias that may influence the proximate read head of the disc drive head.

摘要翻译： 一种用于使磁盘驱动器的写入磁头消磁的装置和方法。 在时钟振荡器的控制下，产生合成去磁脉冲并将其应用于写入器 - 驱动器桥。 同样在时钟振荡器的控制下，由写入器 - 驱动器桥产生的写入电流包含消磁脉冲并且下降到大约零。 消磁脉冲串和写入电流斜坡降低磁头去磁，减少可能影响磁盘驱动器磁头的近似读取磁头的写头磁偏置。

公开(公告)号：US07411755B1

公开(公告)日：2008-08-12

申请号：US11511138

申请日：2006-08-28

申请人： Farbod Aram ,  Pantas Sutardja

发明人： Farbod Aram ,  Pantas Sutardja

IPC分类号： G11B5/09

CPC分类号： G11B5/02 ,  G11B2005/0013 ,  H03K17/04123 ,  H03K17/0414 ,  H03K17/663

摘要： A write driver system comprises first switching devices that generate gate drive signals. A write driver circuit includes second switching devices that are controlled by the gate drive signals. The second switching devices have higher voltage stress thresholds than the first switching devices and wherein the second switching devices have slower switching times than the first switching devices.

摘要翻译： 写驱动器系统包括产生栅极驱动信号的第一开关器件。 写驱动器电路包括由栅极驱动信号控制的第二开关器件。 第二开关器件具有比第一开关器件更高的电压应力阈值，并且其中第二开关器件具有比第一开关器件更慢的开关时间。

公开(公告)号：US07382560B2

公开(公告)日：2008-06-03

申请号：US10249665

申请日：2003-04-29

申请人： Raymond Elijah Barnett ,  Tuan Van Ngo ,  Scott Gary Sorenson

发明人： Raymond Elijah Barnett ,  Tuan Van Ngo ,  Scott Gary Sorenson

IPC分类号： G11B5/09

CPC分类号： G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/59633 ,  G11B20/10009 ,  G11B2005/0013

摘要： A circuit (40) for use in a mass data storage device (10) has first (44) second (46) current driver circuits for providing write currents to the data transducer (18). The first and second current levels are different, the second current level being lower than the first. The first current driver circuit (44) may be used to apply currents representing user data to the data transducer (18) and the second current driver circuit (46) may be used to apply currents representing servo information to the data transducer (18). In addition, the first (44) and second (46) current drivers circuits may be operated at different frequencies. The first (44) and second (46) current driver circuits additionally may share at least some circuit components (70, 72, 74-75, 64-65), and may operate at different write speeds.

摘要翻译： 用于大容量数据存储装置（10）的电路（40）具有用于向数据传感器（18）提供写入电流的第一（44）第二（46）个电流驱动器电路。 第一和第二电流水平不同，第二电流水平低于第一电流水平。 第一电流驱动器电路（44）可用于将表示用户数据的电流施加到数据传感器（18），并且第二电流驱动器电路（46）可用于将表示伺服信息的电流施加到数据传感器（18）。 此外，第一（44）和第二（46）电流驱动器电路可以以不同的频率操作。 第一（44）和第二（46）电流驱动器电路另外可以共享至少一些电路部件（70,72,74-75,64-65），并且可以以不同的写入速度工作。