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1. 发明公开

US20240257832A1 MAGNETIC DISK DEVICE, CONTROL METHOD, AND COMPUTER PROGRAM PRODUCT 审中-公开
公开(公告)号：US20240257832A1
公开(公告)日：2024-08-01
申请号：US18456496
申请日：2023-08-27
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Yoshiyuki ISHIHARA , Shinji TAKAKURA , Makihiko ISHITANI
IPC分类号： G11B5/48 , G11B5/56
CPC分类号： G11B5/4833 , G11B5/56
摘要： According to an embodiment, a magnetic disk device includes: a magnetic disk; an arm; a support member provided at a distal end of the arm; a magnetic head provided on the support member and configured to access the magnetic disk; a first actuator configured to rotate the arm; a second actuator configured to drive the support member; and one or more processors configured to implement a controller configured to perform seek control of the magnetic head. The controller includes: a feedback controller configured to control a first command value for driving the first actuator so as to reduce an error between a position of the magnetic head and a target position; and an iterative learning controller configured to receive an input value based on the error and output a second command value for driving the second actuator by iterative learning.

2. 发明授权

US12046256B2 Data storage device read/write channel with direct radial position demodulation in asynchronous position error signal demodulation 有权
公开(公告)号：US12046256B2
公开(公告)日：2024-07-23
申请号：US18232113
申请日：2023-08-09
申请人： WESTERN DIGITAL TECHNOLOGIES, INC.
发明人： Satoshi Yamamoto
IPC分类号： G11B5/596 , G11B5/56
CPC分类号： G11B5/59627 , G11B5/56 , G11B5/596 , G11B5/59666
摘要： Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator mechanism configured to position one or more heads proximate to a corresponding disk surface of the one or more disks; and one or more processing devices. The one or more processing devices comprise read/write circuitry which comprises an asynchronous demodulation module. The asynchronous demodulation module is configured to receive demodulated null burst signals based on the selected head reading servo burst fields of the corresponding disk surface; and output, based on the demodulated null burst signals, a radial position signal, indicative of a radial position of the selected head.

3. 发明公开

US20240233761A9 DATA STORAGE DEVICE READ/WRITE CHANNEL WITH DIRECT RADIAL POSITION DEMODULATION IN ASYNCHRONOUS POSITION ERROR SIGNAL DEMODULATION 审中-公开
公开(公告)号：US20240233761A9
公开(公告)日：2024-07-11
申请号：US18232113
申请日：2023-08-09
申请人： WESTERN DIGITAL TECHNOLOGIES, INC.
发明人： Satoshi Yamamoto
IPC分类号： G11B5/596 , G11B5/56
CPC分类号： G11B5/59666 , G11B5/56 , G11B5/59627
摘要： Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator mechanism configured to position one or more heads proximate to a corresponding disk surface of the one or more disks; and one or more processing devices. The one or more processing devices comprise read/write circuitry which comprises an asynchronous demodulation module. The asynchronous demodulation module is configured to receive demodulated null burst signals based on the selected head reading servo burst fields of the corresponding disk surface; and output, based on the demodulated null burst signals, a radial position signal, indicative of a radial position of the selected head.

4. 发明授权

US11783854B1 Data storage device with detection and mitigation of non-nominal head heat dissipation 有权
公开(公告)号：US11783854B1
公开(公告)日：2023-10-10
申请号：US17804490
申请日：2022-05-27
申请人： WESTERN DIGITAL TECHNOLOGIES, INC.
发明人： Sukumar Rajauria , Robert Lee Smith
IPC分类号： G11B5/40 , G11B33/14 , G11B5/56
CPC分类号： G11B5/40 , G11B5/56 , G11B33/144
摘要： Various illustrative aspects are directed to a data storage device, comprising one or more disks; a head, configured to be positioned proximate to a disk surface among the one or more disks; a temperature sensor; and one or more processing devices. The one or more processing devices are configured to: detect, via the temperature sensor, a non-nominal heat dissipation of a portion of the head; and, in response to detecting the non-nominal heat dissipation of the portion of the head, mitigate the non-nominal heat dissipation of the portion of the head.

5. 发明授权

US10867633B1 Reduced adjacent track erasure from write retry 有权
公开(公告)号：US10867633B1
公开(公告)日：2020-12-15
申请号：US16782399
申请日：2020-02-05
申请人： Seagate Technology LLC
发明人： Xiong Liu , Brian T. Edgar , Feng Shen , Wenxiang Xie , Quan Li
IPC分类号： G11B20/18 , G11B20/12 , G11B5/56
CPC分类号： G11B20/1816 , G11B5/56 , G11B20/1217 , G11B20/1889 , G11B2020/183 , G11B2020/1823 , G11B2020/1826
摘要： Systems and methods are disclosed for reducing adjacent track erasure from write retry operations. In certain embodiments, an apparatus may comprise a circuit configured to abort a write operation while writing to a selected sector of a disc storage medium during a first revolution of the disc storage medium, and mark the selected sector as a temporary bad sector in a mapping table. The circuit may perform a write retry to continue the write operation starting at a next sector contiguously following the selected sector, without attempting to write the selected sector again, during a second revolution of the magnetic disc.

6. 发明申请

US20190214042A1 Multi-Layer PZT Microactuator Having A Poled But Inactive PZT Constraining Layer 审中-公开
公开(公告)号：US20190214042A1
公开(公告)日：2019-07-11
申请号：US16357181
申请日：2019-03-18
申请人： Magnecomp Corporation
发明人： Kuen Chee Ee , Long Zhang , Peter Hahn , David Glaess
IPC分类号： G11B5/48 , G11B5/55 , G11B5/56
CPC分类号： G11B5/483 , G11B5/4873 , G11B5/5552 , G11B5/56
摘要： A multi-layer piezoelectric microactuator assembly has at least one poled and active piezoelectric layer and one poled but inactive piezoelectric layer. The poled but inactive layer acts as a constraining layer in resisting expansion or contract of the first piezoelectric layer thereby reducing or eliminating bending of the assembly as installed in an environment, thereby increasing the effective stroke length of the assembly. Poling only a single layer would induce stresses into the device; hence, polling both piezoelectric layers even though only one layer will be active in use reduces stresses in the device and therefore increases reliability.

7. 发明授权

US09305593B2 Skew-tolerant multiple-reader array in array-reader based magnetic recording 有权
标题翻译：基于阵列读取器的磁记录中的容错多读取器阵列
公开(公告)号：US09305593B2
公开(公告)日：2016-04-05
申请号：US14446012
申请日：2014-07-29
申请人： Avago Technologies General IP (Singapore) Pte. Ltd.
发明人： Eui Seok Hwang , George Mathew
IPC分类号： G11B21/02 , G11B20/10 , G11B5/56
CPC分类号： G11B20/10388 , G11B5/3958 , G11B5/3964 , G11B5/56 , G11B20/10037 , G11B20/10046
摘要： A method for enhancing read performance in an ARMR system includes: obtaining CTS information for a plurality of readers in a multi-reader head of the ARMR system, the CTS information defining a relationship between skew angle and CTS between respective combinations of subsets of the readers; determining, as a function of the CTS information, a subset of the readers which provides enhanced read performance among the readers for each of a plurality of skew angles; assigning a weight value to each of a plurality of read signals generated by a corresponding one of the readers for each of the skew angles, the weight value being indicative of a performance of the corresponding one of the readers relative to one another; and decoding information read from at least one target track of a magnetic storage medium being read as a function of the read signals and corresponding weight values.
摘要翻译：一种用于增强ARMR系统中的读取性能的方法包括：在ARMR系统的多读取器头部中获得多个读取器的CTS信息，CTS信息定义倾斜角度与读取器子集的各组合之间的CTS之间的关系 ; 根据所述CTS信息确定所述读取器的子集，其为所述读取器中的多个倾斜角中的每一个提供增强的读取性能; 为每个所述倾斜角度的每个所述读取器生成的多个读取信号中的每一个分配权重值，所述权重值指示所述相应读取器之一相对于彼此的性能; 以及根据读取的信号和对应的权重值来读取从磁性存储介质的至少一个目标轨道读取的解码信息。

8. 发明申请

US20160012841A1 MAGNETIC HEAD AND SYSTEM HAVING OFFSET ARRAYS 有权
标题翻译：具有偏移阵列的磁头和系统
公开(公告)号：US20160012841A1
公开(公告)日：2016-01-14
申请号：US14860522
申请日：2015-09-21
申请人： International Business Machines Corporation
发明人： Robert G. Biskeborn , Philipp Herget , Calvin S. Lo
IPC分类号： G11B5/588
CPC分类号： G11B5/588 , G11B5/00813 , G11B5/00826 , G11B5/09 , G11B5/11 , G11B5/115 , G11B5/2652 , G11B5/29 , G11B5/4893 , G11B5/56 , G11B5/584
摘要： In one general embodiment, an apparatus includes at least two modules, each of the modules having an array of transducers, wherein the at least two modules are fixed relative to each other, wherein an axis of each array is defined between opposite ends thereof, wherein the axes of the arrays are oriented about parallel to each other, wherein the array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module are about aligned with the transducers of the second module in an intended direction of tape travel thereacross; and a mechanism for orienting the modules about an axis orthogonal to the plane in which the arrays reside to control a transducer pitch presented to a tape.
摘要翻译：在一个一般实施例中，装置包括至少两个模块，每个模块具有换能器阵列，其中至少两个模块相对于彼此固定，其中每个阵列的轴线限定在其相对端之间，其中阵列的轴线彼此平行取向，其中第一模块的阵列在平行于第二模块的阵列的轴线的第一方向上偏离第二模块的阵列，使得所述第一模块的换能器与所述第二模块的所述换能器沿所述磁带行进的预期方向大致对齐; 以及用于使模块围绕垂直于阵列所在的平面的轴定向以控制呈现给带的换能器间距的机构。

9. 发明授权

US09129614B2 Magnetic head having canted arrays 有权
标题翻译：具有倾斜阵列的磁头
公开(公告)号：US09129614B2
公开(公告)日：2015-09-08
申请号：US13875230
申请日：2013-05-01
申请人： International Business Machines Corporation
发明人： Robert G. Biskeborn , Calvin S. Lo
IPC分类号： G11B5/29 , G11B5/265 , G11B5/008 , G11B5/56
CPC分类号： G11B5/00826 , G11B5/4893 , G11B5/56
摘要： An apparatus according to one embodiment includes a magnetic head, the magnetic head having: a tape bearing surface having a first edge oriented perpendicular to an intended direction of tape travel thereacross; and an array of transducers in and/or adjacent the tape bearing surface, wherein a longitudinal axis of the array is defined between opposite ends thereof, wherein the longitudinal axis of the array of transducers is oriented at an angle relative to the first edge, the angle being between greater than 0.2° and about 10°.
摘要翻译：根据一个实施例的装置包括磁头，磁头具有：带状表面，具有垂直于磁带行进方向的第一边缘; 以及在带支承表面中和/或邻近带状表面的换能器阵列，其中阵列的纵向轴线限定在其相对端之间，其中换能器阵列的纵向轴线相对于第一边缘以一定角度定向，角度大于0.2°至大约10°。

10. 发明授权

US09117471B1 AC MR-offset compensation 有权
标题翻译：交流MR偏置补偿
公开(公告)号：US09117471B1
公开(公告)日：2015-08-25
申请号：US14577400
申请日：2014-12-19
申请人： Seagate Technology LLC
发明人： Xiong Liu , Mingzhong Ding , KianKeong Ooi , Hoang Dung Vu , Chan Fan Lau , Xiang Lu
IPC分类号： G11B5/02 , G11B5/56
CPC分类号： G11B5/56 , G11B5/59627
摘要： An apparatus includes a controller configured to be coupled to a read/write head. The controller is configured to perform various operations including detecting a change in a time interval difference between servo sectors of a servo marked recording medium, converting the change to an offset signal that compensates for the change, and positioning the read/write head relative to the servo mark recording medium in response to the offset signal. The change in the time interval difference is representative of disk slip.
摘要翻译：一种装置包括被配置为耦合到读/写头的控制器。控制器被配置为执行各种操作，包括检测伺服标记的记录介质的伺服扇区之间的时间间隔差的变化，将改变转换为补偿变化的偏移信号，以及将读/写头相对于响应于偏移信号的伺服标记记录介质。时间间隔差异的变化代表了磁盘滑移。

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