公开(公告)号：US08023223B2

公开(公告)日：2011-09-20

申请号：US12878722

申请日：2010-09-09

申请人： Nhan X. Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

发明人： Nhan X. Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

IPC分类号： G11B5/584 ,  G11B21/02

CPC分类号： G11B5/584

摘要： A weighted combining scheme exploits information from two servo channels operating in parallel. A timing-based servo module comprises two synchronous servo channels coupled respectively to receive two digital servo signals read from a data tape. Both channels have outputs for an unweighted parameter estimate and for a measure of the channel reliability. A weight computation module provides first and second weight signals using the measures of channel reliability from the servo channels. An offset computation module provides first and second offset terms which are summed with the unweighted parameter estimates. Multiplying nodes receive the unweighted parameter estimates and the weight signals and outputs offset weighted parameter estimates. A summing node receives the offset weighted parameter estimates and outputs a combined offset weighted parameter estimate to a servomechanism.

摘要翻译： 加权组合方案利用来自并行操作的两个伺服通道的信息。 基于定时的伺服模块包括分别耦合的两个同步伺服通道，以接收从数据磁带读取的两个数字伺服信号。 两个通道具有未加权参数估计的输出和通道可靠性的度量。 权重计算模块使用来自伺服信道的信道可靠性的测量来提供第一和第二加权信号。 偏移计算模块提供与未加权参数估计相加的第一和第二偏移项。 乘法节点接收未加权的参数估计和权重信号并输出​​偏移加权参数估计。 求和节点接收偏移加权参数估计，并将组合的偏移加权参数估计输出到伺服机构。

公开(公告)号：US08000057B2

公开(公告)日：2011-08-16

申请号：US12878704

申请日：2010-09-09

申请人： Nhan X. Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

发明人： Nhan X. Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

IPC分类号： G11B5/584 ,  G11B21/02

CPC分类号： G11B5/584

摘要： A weighted combining scheme exploits information from two servo channels operating in parallel. A timing-based servo module comprises two synchronous servo channels coupled respectively to receive two digital servo signals read from a data tape. Both channels have outputs for an unweighted parameter estimate and for a measure of the channel reliability. A weight computation module provides first and second weight signals using the measures of channel reliability from the servo channels. An offset computation module provides first and second offset terms which are summed with the unweighted parameter estimates. Multiplying nodes receive the unweighted parameter estimates and the weight signals and outputs offset weighted parameter estimates. A summing node receives the offset weighted parameter estimates and outputs a combined offset weighted parameter estimate to a servomechanism.

公开(公告)号：US07982988B2

公开(公告)日：2011-07-19

申请号：US12400369

申请日：2009-03-09

申请人： Nhan X. Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

发明人： Nhan X. Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

IPC分类号： G11B27/36 ,  G11B5/584

CPC分类号： G11B5/584

摘要： A weighted combining scheme exploits information from two servo channels operating in parallel. A timing-based servo module servo module comprises two servo channels coupled respectively to receive two digital servo signals read from a data tape. Both channels have outputs for an unweighted metric and for a measure of the channel reliability. A weight computation module provides first and second weight signals using the measures of channel reliability from the servo channels. A first multiplying node receives a first unweighted metric and a first weight signal and is operable to output a first weighted metric. A second multiplying node receives a second unweighted metric and a second weight signal and outputs a second weighted metric. A summing node receives the first and second weighted metrics and outputs a combined weighted metric to an LPOS word decoder.

摘要翻译： 加权组合方案利用来自并行操作的两个伺服通道的信息。 基于定时的伺服模块伺服模块包括分别耦合的两个伺服通道，以接收从数据磁带读取的两个数字伺服信号。 两个通道都具有未加权度量的输出和通道可靠性的度量。 权重计算模块使用来自伺服信道的信道可靠性的测量来提供第一和第二加权信号。 第一乘法节点接收第一未加权度量和第一加权信号，并且可操作以输出第一加权度量。 第二乘法节点接收第二未加权度量和第二加权信号并输出​​第二加权度量。 求和节点接收第一和第二加权度量，并将组合加权度量输出到LPOS字解码器。

公开(公告)号：US20110170214A1

公开(公告)日：2011-07-14

申请号：US12686302

申请日：2010-01-12

申请人： Nhan X. Bui ,  Edwin R. Childers ,  Eric R. Christensen ,  Reed A. Hancock ,  Diana J. Hellman

发明人： Nhan X. Bui ,  Edwin R. Childers ,  Eric R. Christensen ,  Reed A. Hancock ,  Diana J. Hellman

IPC分类号： G11B20/18 ,  G11B17/34

CPC分类号： G11B15/62 ,  G11B15/43 ,  G11B15/602

摘要： Magnetic tape devices encounter read and/or write errors when the tape is not being passed across the head with the proper tension and/or skew angle. According to one embodiment, a system which corrects for these problems comprises a head having an array of at least one of readers and writers, a drive mechanism for passing a magnetic recording tape over the head, a skew-inducing mechanism coupled to the head for adjusting a skew angle of a longitudinal axis of the array relative to a direction normal to a direction of tape travel over the head, and a controller in communication with the head. The system also determines a tape dimensional stability state of the tape and adjust the skew angle away from normal to the direction of tape travel and lowers a tension of the tape across the head if the tape dimensional stability state is in a contracted state.

摘要翻译： 当磁带没有以适当的张力和/或倾斜角度穿过磁头时，磁带设备会遇到读取和/或写入错误。 根据一个实施例，校正这些问题的系统包括具有读取器和写入器中的至少一个的阵列的头部，用于将磁记录带通过头部的驱动机构，耦合到头部的偏斜引导机构 调整所述阵列的纵向轴线相对于垂直于所述头部上的带行进方向的方向的倾斜角度，以及与所述头部连通的控制器。 该系统还确定胶带的胶带尺寸稳定性状态，并且如果胶带尺寸稳定状态处于收缩状态，则将偏斜角度调整为离开行走方向远离纸张行进方向并降低胶带横过头部的张力。

公开(公告)号：US07391585B1

公开(公告)日：2008-06-24

申请号：US11619101

申请日：2007-01-02

申请人： Josephine F. Bayang ,  Nhan X. Bui ,  Ernest S. Gale ,  Eiji Ogura ,  Kazuhiro Tsuruta

发明人： Josephine F. Bayang ,  Nhan X. Bui ,  Ernest S. Gale ,  Eiji Ogura ,  Kazuhiro Tsuruta

IPC分类号： G11B15/18 ,  G11B15/20 ,  G11B15/43

CPC分类号： G11B15/64 ,  G11B15/1808 ,  G11B15/20 ,  G11B15/43

摘要： Disclosed is a method for reducing occurrences of stick conditions in tape, the method including stopping rotation of a supply reel and take-up reel of a drive that includes a length of tape, a portion of the tape extending between the reels and contacting a head between the reels, wherein the stopping creates a stop condition in the drive, determining if the tape is stuck to the head, dropping tension in the tape between the reels, freeing the tape for movement in a z-direction via the dropping tension, moving the head in y-directions, moving the tape in an x-direction via a rotation of the supply reel a fraction of a rotation, and causing the tape to break contact with the head via the dropping, moving of the tape in the z-direction, moving of the tape in the x-direction, and/or moving of the head in the y-directions.

摘要翻译： 公开了一种用于减少胶带中的条件的发生的方法，该方法包括停止包括一段胶带的驱动器的供带盘和卷取卷轴的旋转，所述带的一部分在卷轴之间延伸并接触头部 在所述卷轴之间，其中所述停止在所述驱动器中产生停止状态，确定所述带是否粘附到所述头部，在所述卷轴之间降低所述带中的张力，释放所述带以通过所述滴下张力沿z方向移动，移动 磁头在y方向上，通过供给卷轴的旋转沿x方向移动磁带的一小部分旋转，并且使磁带经由下落，磁带在z轴方向上移动而与头部断开接触， 方向，沿x方向移动胶带，和/或使头部沿y方向移动。

公开(公告)号：US06963467B2

公开(公告)日：2005-11-08

申请号：US09907306

申请日：2001-07-17

申请人： Nhan X. Bui ,  John Alexander Koski ,  Akimitsu Sasaki ,  Kazuhiro Tsuruta

发明人： Nhan X. Bui ,  John Alexander Koski ,  Akimitsu Sasaki ,  Kazuhiro Tsuruta

IPC分类号： G11B5/584 ,  G11B15/48 ,  G11B15/60 ,  G11B17/00

CPC分类号： G11B5/584

摘要： A method and apparatus for compensating for media shift due to spiral groove roller tape guide is disclosed. The lateral tape shift is measured. Then the control of the coarse actuator is adjusted for the lateral tape shift so that the movement of the coarse actuator follows the tape shift.

摘要翻译： 公开了一种用于补偿由于螺旋槽辊带引导引起的介质偏移的方法和装置。 测量横向胶带位移。 然后调整粗调机构的控制，使其侧向带位移，使得粗执行器的移动跟随磁带位移。

公开(公告)号：US20140022667A1

公开(公告)日：2014-01-23

申请号：US13551667

申请日：2012-07-18

申请人： Allen K. Bates ,  Nhan X. Bui ,  Nils Haustein ,  Stephen L. Schwartz ,  Daniel J. Winarski

发明人： Allen K. Bates ,  Nhan X. Bui ,  Nils Haustein ,  Stephen L. Schwartz ,  Daniel J. Winarski

IPC分类号： G11B5/584

CPC分类号： G11B5/56 ,  G11B5/584 ,  G11B20/10388 ,  G11B20/1211 ,  G11B2020/1281 ,  G11B2220/956

摘要： A servo track has identical servo pattern frames including two pairs of parallel magnetic transitions, the transitions of each pair spaced apart an equal distance, the transitions of the first pair at an azimuth angle to the longitudinal axis of the tape, the transitions of the second pair at an opposite azimuth angle. A servo channel receives signals at first times corresponding to when a servo read head detects the first and second transitions of the first pair of parallel transitions of a servo pattern frame, and second times corresponding to when the servo read head detects the first and second transitions of the second pair of parallel transitions. The servo channel determines a relative lateral movement and velocity between the tape and the tape head based on the azimuth angle and the ratio of the difference of the first and the difference of the second times.

摘要翻译： 伺服轨道具有相同的伺服模式框架，其包括两对平行的磁性过渡，每对的过渡间隔相等的距离，第一对的过渡部分以与磁带的纵向轴线成一个方位角，第二个 对在相反的方位角。 伺服通道在伺服读取头检测到伺服模式帧的第一对并行转换的第一和第二转换的第一时间接收信号，第二次对应于当伺服读取头检测到第一和第二转换时 的第二对平行过渡。 伺服通道基于方位角和第一次与第二次的差的差的比率来确定带和磁带头之间的相对横向运动和速度。

公开(公告)号：US20140022666A1

公开(公告)日：2014-01-23

申请号：US13554966

申请日：2012-07-20

申请人： Nhan X. Bui ,  Kevin B. Judd ,  Tomoko Taketomi

发明人： Nhan X. Bui ,  Kevin B. Judd ,  Tomoko Taketomi

IPC分类号： G11B21/02

CPC分类号： G11B5/00817 ,  G11B5/0083 ,  G11B5/09 ,  G11B5/584 ,  G11B20/10388 ,  G11B27/36

摘要： In one embodiment, a data storage system includes a head; a drive mechanism for passing a medium over the head; a controller electrically coupled to the head; logic encoded in or available to the controller for: periodically determining a stopwrite threshold based on a standard deviation or a variance at a current position error signal sample, wherein a smoothing factor applied to a subsequent calculation of the standard deviation or variance is altered based at least in part on a current magnitude of the standard deviation or the variance; determining whether the current position error signal sample exceeds the stopwrite threshold; disabling writing when the current position error signal sample exceeds the stopwrite threshold; and enabling writing when the current position error signal sample does not exceed the stopwrite threshold. Other systems, methods, and computer program products are described according to more embodiments.

摘要翻译： 在一个实施例中，数据存储系统包括头部; 用于使介质通过头部的驱动机构; 控制器电耦合到头部; 编码在或可用于控制器的逻辑，用于：基于当前位置误差信号样本的标准偏差或方差周期性地确定停止写入阈值，其中应用于随后的标准偏差或方差的计算的平滑因子基于 至少部分地基于当前的标准偏差或方差的大小; 确定当前位置误差信号样本是否超过限制写入阈值; 当当前位置错误信号样本超过限制写入阈值时禁止写入; 并且当当前位置误差信号采样不超过限制写入阈值时使能写入。 根据更多实施例描述其它系统，方法和计算机程序产品。

公开(公告)号：US20130335857A1

公开(公告)日：2013-12-19

申请号：US13526529

申请日：2012-06-19

申请人： Nhan X. Bui ,  Jens Jelitto ,  Angeliki Pantazi

发明人： Nhan X. Bui ,  Jens Jelitto ,  Angeliki Pantazi

IPC分类号： G11B5/584 ,  G11B5/56

CPC分类号： G11B5/584

摘要： A tape drive configured to accurately position a head actuator in the presence of physical disturbances is disclosed. The tape drive includes a track-follow controller to position a head actuator over data tracks on magnetic tape. The tape drive further includes a disturbance observer configured to estimate a vibration disturbance and output a compensation signal to assist the track-follow controller to accurately position the head actuator over the data tracks in the presence of vibration. When estimating the vibration disturbance, the disturbance observer takes into account vibration frequency characteristics, such as frequency characteristics derived from a vibration specification associated with the tape drive, or frequency characteristics derived from known vibration disturbances experienced by the tape drive. A corresponding method is also disclosed.

摘要翻译： 公开了一种配置成在存在物理扰动的情况下精确地定位头致动器的磁带驱动器。 磁带驱动器包括轨道跟随控制器，用于将磁头执行器定位在磁带上的数据轨道上。 磁带驱动器还包括被配置为估计振动干扰并输出补偿信号的扰动观察器，以帮助跟踪跟踪控制器在存在振动的情况下将头致动器精确地定位在数据轨道上。 当估计振动扰动时，扰动观测器考虑振动频率特性，例如从与磁带驱动相关联的振动规范得到的频率特性，或由磁带机所经历的已知振动干扰导出的频率特性。 还公开了相应的方法。

公开(公告)号：US20120307402A1

公开(公告)日：2012-12-06

申请号：US13484176

申请日：2012-05-30

申请人： Nhan X. Bui ,  Reed A. Hancock ,  Randy C. Inch

发明人： Nhan X. Bui ,  Reed A. Hancock ,  Randy C. Inch

IPC分类号： G11B5/584

CPC分类号： G11B21/103 ,  G11B5/584

摘要： According to one embodiment, a method includes sensing a first servo sensor while a longitudinal tape is moved in a first direction; determining position error between the magnetic head and a desired position related to the at least one defined servo track; providing signals to operate a fine actuator to translate the magnetic head laterally in a manner to reduce the determined position error; calculating a first average position of the magnetic head for at least one first run-out cycle while the longitudinal tape is moved in the first direction; calculating a first offset of the magnetic head while the longitudinal tape is moved in the first direction; operating a coarse actuator to position the coarse actuator substantially at a target position using the first offset and the first average position.

摘要翻译： 根据一个实施例，一种方法包括在纵向带沿第一方向移动时感测第一伺服传感器; 确定所述磁头与与所述至少一个限定的伺服磁道相关的期望位置之间的位置误差; 提供信号以操作精细致动器以以减少所确定的位置误差的方式横向地转动磁头; 当所述纵向带沿所述第一方向移动时，计算所述磁头的至少一个第一偏移周期的第一平均位置; 当所述纵向带沿所述第一方向移动时计算所述磁头的第一偏移; 操作粗略致动器以使用第一偏移和第一平均位置将粗调制器基本上定位在目标位置。