公开(公告)号：US08559121B2

公开(公告)日：2013-10-15

申请号：US13338658

申请日：2011-12-28

申请人： Kosuke Saito ,  Kazuaki Usui ,  Masaharu Kawamura

发明人： Kosuke Saito ,  Kazuaki Usui ,  Masaharu Kawamura

IPC分类号： G11B27/02

CPC分类号： G11B5/024 ,  G11B5/012 ,  G11B20/1879

摘要： A method of targeted corruption of user data in a shingled magnetic recording disk includes identifying user data on a Track_N targeted for corruption; identifying a readback centerline of the Track_N; identifying a readback centerline of an adjacent track to Track_N; acquiring user data of the adjacent track; and rewriting the user data of the adjacent track with an offset write centerline to overwrite magnetic material at the readback centerlines of both Track_N and the adjacent track.

摘要翻译： 一种在带状磁记录盘中的用户数据有针对性地破坏的方法包括识别针对腐败的Track_N的用户数据; 识别Track_N的回读中心线; 识别Track_N的相邻轨道的回读中心线; 获取相邻轨道的用户数据; 并用偏移写入中心线重写相邻轨道的用户数据，以覆盖Track_N和相邻轨道的回读中心线处的磁性材料。

公开(公告)号：US20130170061A1

公开(公告)日：2013-07-04

申请号：US13338658

申请日：2011-12-28

申请人： Kosuke Saito ,  Kazuaki Usui ,  Masaharu Kawamura

发明人： Kosuke Saito ,  Kazuaki Usui ,  Masaharu Kawamura

IPC分类号： G11B5/09 ,  G11B5/024

CPC分类号： G11B5/024 ,  G11B5/012 ,  G11B20/1879

摘要： A method of targeted corruption of user data in a shingled magnetic recording disk includes identifying user data on a Track_N targeted for corruption; identifying a readback centerline of the Track_N; identifying a readback centerline of an adjacent track to Track_N; acquiring user data of the adjacent track; and rewriting the user data of the adjacent track with an offset write centerline to overwrite magnetic material at the readback centerlines of both Track_N and the adjacent track.

摘要翻译： 一种在带状磁记录盘中的用户数据有针对性地破坏的方法包括识别针对腐败的Track_N的用户数据; 识别Track_N的回读中心线; 识别Track_N的相邻轨道的回读中心线; 获取相邻轨道的用户数据; 并用偏移写入中心线重写相邻轨道的用户数据，以覆盖Track_N和相邻轨道的回读中心线处的磁性材料。

公开(公告)号：US20100142082A1

公开(公告)日：2010-06-10

申请号：US12631729

申请日：2009-12-04

申请人： Chikako Sakagami ,  Kazuhisa Shishida ,  Isao Yoneda ,  Kazuaki Usui ,  Hiroshi Uchida ,  Takeshi Saito ,  Kenji Tomida

发明人： Chikako Sakagami ,  Kazuhisa Shishida ,  Isao Yoneda ,  Kazuaki Usui ,  Hiroshi Uchida ,  Takeshi Saito ,  Kenji Tomida

IPC分类号： G11B21/02

CPC分类号： G11B5/5582 ,  G11B5/596 ,  G11B5/59622

摘要： A disk drive. The disk drive includes a head, a moving mechanism, a first peak filter, an adaptive peak filter, and a filter controller. The head is configured to read servo data on a disk at sampling frequency. The moving mechanism is configured to move the head in proximity with a recording surface of the disk. The first peak filter has a fixed peak frequency and a variable gain, and is configured to be inserted into a servo loop. The servo loop is configured to position the head with position error signals between servo data read by the head and a target position. The adaptive peak filter has a variable peak frequency and a variable gain, and is configured to be inserted into the servo loop. The filter controller is configured to control the gain of the adaptive peak filter according to the gain of the first peak filter.

摘要翻译： 磁盘驱动器 磁盘驱动器包括磁头，移动机构，第一峰值滤波器，自适应峰值滤波器和滤波器控制器。 磁头被配置为以采样频率读取磁盘上的伺服数据。 移动机构被配置为使磁头靠近磁盘的记录表面移动。 第一峰值滤波器具有固定的峰值频率和可变增益，并被配置为插入到伺服环路中。 伺服回路被配置为在头部读取的伺服数据与目标位置之间定位头部位置误差信号。 自适应峰值滤波器具有可变的峰值频率和可变增益，并被配置为插入到伺服环路中。 滤波器控制器被配置为根据第一峰值滤波器的增益来控制自适应峰值滤波器的增益。

公开(公告)号：US08059356B2

公开(公告)日：2011-11-15

申请号：US12631729

申请日：2009-12-04

申请人： Chikako Sakagami ,  Kazuhisa Shishida ,  Isao Yoneda ,  Kazuaki Usui ,  Hiroshi Uchida ,  Takeshi Saito ,  Kenji Tomida ,  Takenori Atsumi

发明人： Chikako Sakagami ,  Kazuhisa Shishida ,  Isao Yoneda ,  Kazuaki Usui ,  Hiroshi Uchida ,  Takeshi Saito ,  Kenji Tomida ,  Takenori Atsumi

IPC分类号： G11B21/02

CPC分类号： G11B5/5582 ,  G11B5/596 ,  G11B5/59622

摘要： A disk drive. The disk drive includes a head, a moving mechanism, a first peak filter, an adaptive peak filter, and a filter controller. The head is configured to read servo data on a disk at sampling frequency. The moving mechanism is configured to move the head in proximity with a recording surface of the disk. The first peak filter has a fixed peak frequency and a variable gain, and is configured to be inserted into a servo loop. The servo loop is configured to position the head with position error signals between servo data read by the head and a target position. The adaptive peak filter has a variable peak frequency and a variable gain, and is configured to be inserted into the servo loop. The filter controller is configured to control the gain of the adaptive peak filter according to the gain of the first peak filter.

摘要翻译： 磁盘驱动器 磁盘驱动器包括磁头，移动机构，第一峰值滤波器，自适应峰值滤波器和滤波器控制器。 磁头被配置为以采样频率读取磁盘上的伺服数据。 移动机构被配置为使磁头靠近磁盘的记录表面移动。 第一峰值滤波器具有固定的峰值频率和可变增益，并被配置为插入到伺服环路中。 伺服回路被配置为在头部读取的伺服数据与目标位置之间定位头部位置误差信号。 自适应峰值滤波器具有可变的峰值频率和可变增益，并被配置为插入到伺服环路中。 滤波器控制器被配置为根据第一峰值滤波器的增益来控制自适应峰值滤波器的增益。

公开(公告)号：US20080297942A1

公开(公告)日：2008-12-04

申请号：US11894873

申请日：2007-08-21

申请人： Kazuaki Usui ,  Masashi Kisaka ,  Hidefumi Tominaga ,  Koumei Hanaoka ,  Masaki Nagashima

发明人： Kazuaki Usui ,  Masashi Kisaka ,  Hidefumi Tominaga ,  Koumei Hanaoka ,  Masaki Nagashima

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, an error signal generator of a drive unit generates a position error signal (PES) on the basis of servo data read out from a magnetic disk. On the assumption that a frequency of a periodic variation component included in the PES is a target frequency, if a target frequency deviates from an effective frequency range of a digital filter, a downsampler down-samples the PES, and then supplies the PES to the digital filter so that the effective frequency range is shifted. As a result, within the shifted effective frequency range, a setting changing unit can control a setting frequency of the digital filter so that the setting frequency follows the target frequency. Therefore, it is possible to effectively reduce a signal component of the target frequency (a periodic variation component included in the PES).

摘要翻译： 根据本发明的实施例提供一种驱动单元，其能够令人满意地执行定位控制，其中包括在有效控制的位置误差信号中的扰动分量。 根据一个实施例，驱动单元的误差信号发生器基于从磁盘读出的伺服数据产生位置误差信号（PES）。 假设PES中包含的周期性变化分量的频率是目标频率，则如果目标频率偏离数字滤波器的有效频率范围，则下采样器对PES进行下采样，然后将PES提供给 数字滤波器，使有效频率范围发生变化。 结果，在移动的有效频率范围内，设定改变单元可以控制数字滤波器的设定频率，使得设定频率跟随目标频率。 因此，有可能有效地降低目标频率的信号分量（包括在PES中的周期性变化分量）。

公开(公告)号：US20060152843A1

公开(公告)日：2006-07-13

申请号：US11331921

申请日：2006-01-12

申请人： Takehiko Hamaguchi ,  Hideaki Maeda ,  Kazuaki Usui ,  Kazuhisa Shishida ,  Takashi Konishi

发明人： Takehiko Hamaguchi ,  Hideaki Maeda ,  Kazuaki Usui ,  Kazuhisa Shishida ,  Takashi Konishi

IPC分类号： G11B21/02

CPC分类号： G11B5/59655

摘要： Embodiments of the invention provide optimum servo patterns for perpendicular magnetic recording method. In one embodiment, a burst field of servo patterns is composed of burst-signal parts in each of which a constant frequency occurs successively and zero-signal parts each of which has been demagnetized to a state of zero-magnetization, and the total magnetization of the burst field is made approximately 0. The zero signal portions are formed by shutting off a write current at a time during an operation to record servo patterns on a disk initialized to a state of zero-magnetization. The total magnetization of all servo patterns is made approximately 0 by encoding an address mark field and a track code field of servo patterns by a phase shift method.

摘要翻译： 本发明的实施例提供了用于垂直磁记录方法的最佳伺服模式。 在一个实施例中，伺服模式的脉冲串区域由突发信号部分组成，其中每个脉冲串信号部分连续出现恒定频率，零信号部分已经被去磁到零磁化状态，并且总磁化强度 脉冲串区域被制成大约0.零信号部分是通过在操作期间的一个时刻关闭写入电流来形成的，以便在初始化为零磁化的状态的盘上记录伺服模式。 通过相移法对伺服模式的地址标记场和轨迹代码域进行编码，使所有伺服模式的总磁化大致为0。

公开(公告)号：US07073037B2

公开(公告)日：2006-07-04

申请号：US10601632

申请日：2003-06-24

申请人： Atsushi Okuyama ,  Seiichi Domyo ,  Hitoshi Ogawa ,  Kazuaki Usui

发明人： Atsushi Okuyama ,  Seiichi Domyo ,  Hitoshi Ogawa ,  Kazuaki Usui

IPC分类号： G06F12/14

CPC分类号： G06F21/80 ,  G11B20/00086 ,  G11B20/0021

摘要： An information recording/reproducing system in which a host system making access to a magnetic disk apparatus can be limited to a specific one. A magnetic disk apparatus includes an authentication key generating block for generating an authentication key on the basis of physical characteristic(s) of the magnetic disk apparatus itself. The magnetic disk apparatus and the host system have, respectively, authentication key recording block for recording the authentication key and authentication data generating block for generating authentication data on the basis of the authentication key. Access from the host system to information of the magnetic disk apparatus is controlled based on the authentication data of the host system and the authentication data of the magnetic disk apparatus.

摘要翻译： 一种信息记录/再现系统，其中访问磁盘装置的主机系统可以被限制到特定的一个。 磁盘装置包括基于磁盘装置本身的物理特性产生认证密钥的认证密钥生成块。 磁盘装置和主机系统分别具有用于记录认证密钥的认证密钥记录块和用于基于认证密钥生成认证数据的认证数据生成块。 基于主机系统的认证数据和磁盘装置的认证数据来控制从主机系统到磁盘装置的信息的访问。

公开(公告)号：US07561369B2

公开(公告)日：2009-07-14

申请号：US11894873

申请日：2007-08-21

申请人： Kazuaki Usui ,  Masashi Kisaka ,  Hidefumi Tominaga ,  Koumei Hanaoka ,  Masaki Nagashima

发明人： Kazuaki Usui ,  Masashi Kisaka ,  Hidefumi Tominaga ,  Koumei Hanaoka ,  Masaki Nagashima

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, an error signal generator of a drive unit generates a position error signal (PES) on the basis of servo data read out from a magnetic disk. On the assumption that a frequency of a periodic variation component included in the PES is a target frequency, if a target frequency deviates from an effective frequency range of a digital filter, a downsampler down-samples the PES, and then supplies the PES to the digital filter so that the effective frequency range is shifted. As a result, within the shifted effective frequency range, a setting changing unit can control a setting frequency of the digital filter so that the setting frequency follows the target frequency. Therefore, it is possible to effectively reduce a signal component of the target frequency (a periodic variation component included in the PES).

摘要翻译： 根据本发明的实施例提供一种驱动单元，其能够令人满意地执行定位控制，其中包括在有效控制的位置误差信号中的扰动分量。 根据一个实施例，驱动单元的误差信号发生器基于从磁盘读出的伺服数据产生位置误差信号（PES）。 假设PES中包含的周期性变化分量的频率是目标频率，则如果目标频率偏离数字滤波器的有效频率范围，则下采样器对PES进行下采样，然后将PES提供给 数字滤波器，使有效频率范围发生变化。 结果，在移动的有效频率范围内，设定改变单元可以控制数字滤波器的设定频率，使得设定频率跟随目标频率。 因此，有可能有效地降低目标频率的信号分量（包括在PES中的周期性变化分量）。

公开(公告)号：US07365933B2

公开(公告)日：2008-04-29

申请号：US11331921

申请日：2006-01-12

申请人： Takehiko Hamaguchi ,  Hideaki Maeda ,  Kazuaki Usui ,  Kazuhisa Shishida ,  Takashi Konishi

发明人： Takehiko Hamaguchi ,  Hideaki Maeda ,  Kazuaki Usui ,  Kazuhisa Shishida ,  Takashi Konishi

IPC分类号： G11B5/596

CPC分类号： G11B5/59655

摘要： Embodiments of the invention provide optimum servo patterns for perpendicular magnetic recording method. In one embodiment, a burst field of servo patterns is composed of burst-signal parts in each of which a constant frequency occurs successively and zero-signal parts each of which has been demagnetized to a state of zero-magnetization, and the total magnetization of the burst field is made approximately 0. The zero signal portions are formed by shutting off a write current at a time during an operation to record servo patterns on a disk initialized to a state of zero-magnetization. The total magnetization of all servo patterns is made approximately 0 by encoding an address mark field and a track code field of servo patterns by a phase shift method.

摘要翻译： 本发明的实施例提供了用于垂直磁记录方法的最佳伺服模式。 在一个实施例中，伺服模式的脉冲串区域由突发信号部分组成，其中每个脉冲串信号部分连续出现恒定频率，零信号部分已经被去磁到零磁化状态，并且总磁化强度 脉冲串区域被制成大约0.零信号部分是通过在操作期间的一个时刻关闭写入电流来形成的，以便在初始化为零磁化的状态的盘上记录伺服模式。 通过相移法对伺服模式的地址标记场和轨迹代码域进行编码，使所有伺服模式的总磁化大致为0。

公开(公告)号：US06597532B1

公开(公告)日：2003-07-22

申请号：US09580954

申请日：2000-05-30

申请人： Kazuaki Usui ,  Keiko Watanabe ,  Kei Yasuna ,  Tetsuya Hamaguchi ,  Tsuyoshi Arai

发明人： Kazuaki Usui ,  Keiko Watanabe ,  Kei Yasuna ,  Tetsuya Hamaguchi ,  Tsuyoshi Arai

IPC分类号： G11B3314

CPC分类号： G11B33/08 ,  G11B5/5582

摘要： An acceleration detecting apparatus for a magnetic disk apparatus capable of detecting with high reliability the disturbances such as rotational and translational shocks and vibrations applied externally to the magnetic disk apparatus to thereby prevent destruction or the like damages of data recorded on a disk of the magnetic disk apparatus upon occurrence of off-track event under the influence of the disturbance. The apparatus includes a pair of acceleration detectors for detecting acceleration in two directions extending discretely in parallel to each other. The acceleration detectors are disposed at positions closer to the magnetic disk relative to a pivot shaft for a head supporting arm as viewed in a longitudinal direction of an oblong box-like casing of the magnetic disk apparatus in a plane which forms an angle not greater than 10 degrees relative to the plane of the magnetic disk. By employing the angular acceleration detectors in combination with an angular velocity detector, the rotational disturbances due to rotational shock/vibration can be detected with much enhanced reliability, and destruction of the data recorded on the magnetic disk due to the off-track read/write operation can positively be prevented.

摘要翻译： 一种磁盘装置的加速度检测装置，其能够高度可靠地检测在磁盘装置外部施加的旋转和平移冲击和振动等的干扰，从而防止记录在磁盘的盘上的数据的破坏或类似损坏 发生在扰动影响下的偏离轨道事件的装置。 该装置包括一对加速度检测器，用于检测彼此离散地延伸的两个方向上的加速度。 加速度检测器设置在相对于用于磁头支撑臂的枢转轴靠近磁盘的位置处，该磁头支撑臂在磁盘设备的长方形盒状壳体的纵向方向上在形成不大于 相对于磁盘的平面为10度。 通过采用与角速度检测器结合使用的角加速度检测器，可以以更大的可靠性检测旋转冲击/振动引起的旋转干扰，并且由于偏离轨迹读/写而破坏记录在磁盘上的数据 可以有效防止操作。