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公开(公告)号：US06937425B2
公开(公告)日：2005-08-30
申请号：US10464102
申请日：2003-06-18
申请人： Vernon L. Knowles , Ted A. Brooks
发明人： Vernon L. Knowles , Ted A. Brooks
CPC分类号： G11B5/584
摘要： A head-track alignment system and method. An embodiment of the system comprises: a head assembly capable of detecting arrival of servo frames in a first and second servo track of a tape; an alignment processor coupled to the head assembly generating a head-track alignment signal based on a comparison of the arrival times of the servo frames in the first and second servo tracks; and wherein the head-track alignment signal can be generated while accessing the tape. An embodiment of the method comprises: determining tape tilt with respect to a head assembly of a tape drive while accessing a tape, and compensating for the tape tilt.
摘要翻译： 头轨对准系统和方法。 该系统的一个实施例包括：能够检测伺服帧到达磁带的第一和第二伺服轨道中的磁头组件; 耦合到所述头部组件的对准处理器，其基于所述伺服帧在所述第一和第二伺服轨道中的到达时间的比较来产生头轨道对准信号; 并且其中可以在访问磁带的同时产生头轨对准信号。 该方法的一个实施例包括：在访问磁带的同时确定相对于磁带驱动器的磁头组件的磁带倾斜度，以及补偿磁带倾斜。
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公开(公告)号：US07289289B2
公开(公告)日：2007-10-30
申请号：US11260791
申请日：2005-10-27
申请人： Carl R. Hoerger , Vernon L. Knowles
发明人： Carl R. Hoerger , Vernon L. Knowles
IPC分类号： G11B21/02
CPC分类号： G11B5/584
摘要： To access data on a storage medium, at least three servo stripes simultaneously recorded in a servo track are read. The at least three servo stripes have different orientations on the servo track. An indication of a lateral position of a storage medium access head with respect to the servo track is generated based on reading the at least three servo stripes.
摘要翻译： 为了访问存储介质上的数据，读取同时记录在伺服轨道中的至少三个伺服条带。 至少三个伺服条纹在伺服轨道上具有不同的取向。 基于读取至少三个伺服条来产生存储介质存取头相对于伺服轨迹的横向位置的指示。
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公开(公告)号：US06992857B2
公开(公告)日：2006-01-31
申请号：US10770746
申请日：2004-02-02
IPC分类号： G11B5/584
CPC分类号： G11B5/584
摘要： In one embodiment, a servo positioning method includes deriving a first servo signal S1 from a first servo band, deriving a second servo signal S2 from a second servo band, defining a head element reference between the servo bands, weighting each servo signal according to a ratio of distances between the head element reference and a location on each servo band, and computing a servo control signal based on the weighted servo signals.
摘要翻译： 在一个实施例中，伺服定位方法包括从第一伺服带导出第一伺服信号S 1> 1，从第二伺服带导出第二伺服信号S 2> 2，定义 伺服带之间的头元件参考，根据头元件基准和每个伺服带之间的位置之间的距离比，对每个伺服信号进行加权，以及基于加权的伺服信号计算伺服控制信号。
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公开(公告)号：US4823212A
公开(公告)日：1989-04-18
申请号：US935663
申请日：1986-11-26
申请人： Vernon L. Knowles , Robert E. Kier
发明人： Vernon L. Knowles , Robert E. Kier
CPC分类号： G11B20/1217 , G11B27/3027 , G11B5/59655 , G11B2020/1282 , G11B2220/20
摘要： The system and method for normalizing the amplitude of servo code derived signals in a disc drive, includes an improved embedded servo code format of separate magnetic dibit fields, recorded in half track steps. One magnetic dibit field is an automatic gain control field in which the magnetic head sees the same amount of magnetic dibit regardless of its position with respect to the track. A fast settling AGC loop responding to signals from the AGC field, produces a gain adjust signal while the magnetic head is still in the AGC field, which is used to normalize the amplitude of all following servo code and data code signals in that sector. The cycle of automatic gain control is repeated for each track in each sector. A sector mark following the AGC field has a magnetic dibit pattern which is fault tolerant. It is transduced in three parts to minimize error in its detection and identification and provides a timing reference for servo signals which follow. A defect dibit is recorded if the following servo gap is found to be defective during manufacture so that the next servo gap may be ignored. A track position servo code field provides signals for track following.
摘要翻译： 用于对盘驱动器中的伺服码导出信号的振幅进行归一化的系统和方法包括以半径步长记录的独立磁双列场的改进的嵌入式伺服码格式。 一个磁二比特场是自动增益控制场，其中磁头看到相同数量的磁双位，而不管其相对于轨道的位置如何。 响应于来自AGC场的信号的快速建立AGC环路产生增益调整信号，同时磁头仍然在AGC场中，其用于归一化该扇区中所有后续的伺服码和数据码信号的振幅。 对于每个扇区中的每个轨道重复自动增益控制的周期。 AGC场之后的扇区标记具有容错的磁性二位图案。 它以三部分转换，以最小化其检测和识别中的错误，并为跟随的伺服信号提供定时参考。 如果在制造过程中发现以下伺服间隙有缺陷，记录下一个伺服间隙可能会忽略的缺陷双位。 轨道位置伺服码字段为跟踪跟踪提供信号。
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公开(公告)号：US07268970B2
公开(公告)日：2007-09-11
申请号：US10719515
申请日：2003-11-20
CPC分类号： G11B5/584
摘要： Electromagnetic tape head position is adjusted according to vibration indicative information received from vibration sensor secured to tape transport mechanism that supports the tape head.
摘要翻译： 根据从固定在支撑磁带头的磁带传送机构的振动传感器接收到的振动指示信息来调节电磁磁头位置。
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6.发明授权Method and apparatus for minimizing seek time in a disk drive by increasing power amplifier power based on power amplifier voltage head room 失效通过增加基于功率放大器电压头部的功率放大器功率来最小化磁盘驱动器中的寻道时间的方法和装置
公开(公告)号：US5684653A
公开(公告)日：1997-11-04
申请号：US586429
申请日：1996-01-16
申请人： Vernon L. Knowles
发明人： Vernon L. Knowles
CPC分类号： G11B5/5547 , G11B21/083
摘要： A system for minimizing seek time in a disk drive having a power amplifier for controlling a servo actuator. The system includes at least one output terminal of the power amplifier connected to a processor for detecting and calculating a head room voltage for the power amplifier for seek operations, the head room voltage indicative of a margin of power available for controlling seek operations. A preferred method includes calculating a head room voltage for the power amplifier by detecting a saturation value of the amplifier during an acceleration phase in a first seek direction, and detecting an output voltage during a deceleration phase for a second seek operation in an opposite direction. The method further includes adjusting power to the power amplifier on a next seek operation based on the head room voltage calculated, such that at least some of the margin of power available identified by the head room voltage is used on the next seek operation for reducing seek time.
摘要翻译： 一种用于最小化具有用于控制伺服致动器的功率放大器的磁盘驱动器中的寻道时间的系统。 该系统包括连接到处理器的功率放大器的至少一个输出端子，用于检测和计算用于寻道操作的功率放大器的头部房间电压，头部房间电压指示可用于控制寻道操作的功率余量。 优选的方法包括通过在第一搜索方向的加速阶段中检测放大器的饱和度值，并且在相反方向上的第二寻找操作的减速阶段期间检测输出电压来计算功率放大器的头房电压。 该方法还包括基于所计算的头房电压在下一个寻道操作中调整功率放大器的功率，使得在下一个寻道操作中使用由头房电压识别的功率余量中的至少一些可用于减少寻道 时间。
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7.发明授权Method and apparatus for reducing phase lag resulting from digital to analog conversion 失效用于减少由数模转换产生的相位滞后的方法和装置
公开(公告)号：US5682159A
公开(公告)日：1997-10-28
申请号：US603626
申请日：1996-02-21
CPC分类号： H03M1/0836 , G11B21/106 , G11B7/0941 , G11B20/10527 , H03M1/662
摘要： A method and apparatus for implementing a zero order hold function in the digital to analog conversion process in a digital control system reduces the phase lag contributed by the digital to analog conversion process relative to a conventional implementation of the zero order hold function. The apparatus for implementing the reduced phase lag zero order hold function employs a digital signal processor, a plurality of digital buffers, a digital multiplexing element, and a digital to analog converter. Phase lag is reduced by generating, from the digital to analog converter, for a fraction of the sample period, a waveform having a constant analog voltage with an amplitude which is scaled by the reciprocal of said fraction relative to a conventional zero order hold function. During the remainder of the sample period a substantially constant offset analog voltage is generated by the digital to analog converter. Alternatively, the time compression and amplitude scaling required to implement the reduced phase lag zero order hold function can be performed within the digital signal processor in the digital control system.
摘要翻译： 在数字控制系统中的数模转换处理中实现零阶保持功能的方法和装置相对于零级保持功能的传统实现，减少了数模转换过程所产生的相位滞后。 用于实现减少相位滞后零阶保持功能的装置采用数字信号处理器，多个数字缓冲器，数字多路复用元件和数模转换器。 通过从数字模拟转换器产生一小部分采样周期的相位滞后，具有恒定模拟电压的波形，其具有相对于常规零级保持功能由所述分数的倒数缩放的幅度。 在采样周期的剩余时间期间，数模转换器产生基本恒定的偏移模拟电压。 或者，实现减少的相位滞后零阶保持功能所需的时间压缩和幅度缩放可以在数字控制系统中的数字信号处理器内执行。
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公开(公告)号：US08959387B2
公开(公告)日：2015-02-17
申请号：US13562852
申请日：2012-07-31
申请人： Donald J. Fasen , Vernon L. Knowles
发明人： Donald J. Fasen , Vernon L. Knowles
IPC分类号： G06F11/07
CPC分类号： G11B27/36 , G06F11/1443 , G11B2220/90
摘要： The present disclosure provides techniques for operating a tape drive. A method of operating a tape drive includes monitoring a parameter of the tape drive during a data access operation. The method also includes detecting an access failure. The method further includes selecting a treatment based on the parameter, applying the treatment, and performing a retry.
摘要翻译： 本公开提供了用于操作磁带驱动器的技术。 操作磁带驱动器的方法包括在数据访问操作期间监视磁带驱动器的参数。 该方法还包括检测访问失败。 该方法还包括基于参数选择治疗，应用治疗并执行重试。
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公开(公告)号：US07835103B2
公开(公告)日：2010-11-16
申请号：US12242180
申请日：2008-09-30
IPC分类号： G11B15/087 , G11B15/22 , G11B15/43 , G11B15/44
CPC分类号： G11B5/00817 , G11B5/09 , G11B5/78
摘要： A system and method for reducing tape wear in a magnetic tape system. A tape drive comprises a wrap reverse location controller. The wrap reverse location controller determines a magnetic tape reversal location. The tape drive reverses the direction of the magnetic tape at the reversal location. The wrap reverse location controller determines the tape reversal location by varying, relative to the tape heads, the longitudinal tape location at which tape direction reversals are performed at each end of the tape.
摘要翻译： 一种用于减少磁带系统中的磁带磨损的系统和方法。 磁带驱动器包括回卷位置控制器。 包装反向位置控制器确定磁带反转位置。 磁带驱动器在反转位置反转磁带的方向。 卷绕反向位置控制器通过相对于带头改变在带的每个端部处进行带方向反转的纵向带位置来确定带的反转位置。
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公开(公告)号：US20100079907A1
公开(公告)日：2010-04-01
申请号：US12242180
申请日：2008-09-30
IPC分类号： G11B5/027
CPC分类号： G11B5/00817 , G11B5/09 , G11B5/78
摘要： A system and method for reducing tape wear in a magnetic tape system. A tape drive comprises a wrap reverse location controller. The wrap reverse location controller determines a magnetic tape reversal location. The tape drive reverses the direction of the magnetic tape at the reversal location. The wrap reverse location controller determines the tape reversal location by varying, relative to the tape heads, the longitudinal tape location at which tape direction reversals are performed at each end of the tape.
摘要翻译： 一种用于减少磁带系统中的磁带磨损的系统和方法。 磁带驱动器包括回卷位置控制器。 包装反向位置控制器确定磁带反转位置。 磁带驱动器在反转位置反转磁带的方向。 卷绕反向位置控制器通过相对于带头改变在带的每个端部处进行带方向反转的纵向带位置来确定带的反转位置。
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