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1. 发明授权

US09997185B1 Data storage device employing upsampling to compensate for high frequency repeatable runout 有权
公开(公告)号：US09997185B1
公开(公告)日：2018-06-12
申请号：US15817624
申请日：2017-11-20
申请人： Western Digital Technologies, Inc.
发明人： Hiroshi Uchida
IPC分类号： G11B5/596 , G11B5/55
CPC分类号： G11B5/59688 , G11B5/55 , G11B5/5534 , G11B5/5547 , G11B5/596 , G11B5/59622 , G11B5/59627 , G11B5/59661
摘要： A data storage device comprising a head actuated over a disk comprising a plurality of tracks. The head is positioned over a target track, and a sampled position error signal (PES) is generated representing a position of the head relative to the target track. The sampled PES is filtered with a servo compensator to generate a sampled control signal, and the sampled control signal is upsampled to generate an upsampled control signal. The sampled PES is upsampled to generate an upsampled PES, and the upsampled PES is processed to generate compensation values. The upsampled control signal is combined with the compensation values to generate a compensated control signal, and the position of the head over the target track is adjusted based on the compensated control signal.

2. 发明授权

US09997182B1 Data storage device employing balanced current drive to unload multiple voice coil motors 有权
公开(公告)号：US09997182B1
公开(公告)日：2018-06-12
申请号：US15808719
申请日：2017-11-09
申请人： Western Digital Technologies, Inc.
发明人： Brian K. Tanner , James J. Ng
IPC分类号： G11B5/09 , G11B5/48 , G11B21/08 , G11B5/55 , G11B19/20
CPC分类号： G11B5/4813 , G11B5/09 , G11B5/48 , G11B5/4833 , G11B5/55 , G11B5/553 , G11B5/5547 , G11B19/20 , G11B21/08 , G11B21/083
摘要： A data storage device is disclosed comprising a first voice coil motor (VCM) comprising a first voice coil configured to actuate a first head over a first disk, a second VCM comprising a second voice coil configured to actuate a second head over a second disk, and a spindle motor configured to rotate the first and second disk, wherein during a power failure the first and second disks rotating causes the spindle motor to generate a back electromotive force (BEMF) voltage. During the power failure the first and second VCMs are unloaded, wherein during a first interval the first voice coil is connected to the BEMF voltage and the second voice coil is disconnected from the BEMF voltage, and during a second interval the second voice coil is connected to the BEMF voltage and the first voice coil is disconnected from the BEMF voltage.

3. 发明授权

US09947350B1 Method of detecting back electromotive force in electro-mechanical actuators, corresponding device and apparatus 有权
公开(公告)号：US09947350B1
公开(公告)日：2018-04-17
申请号：US15636426
申请日：2017-06-28
申请人： STMicroelectronics S.R.L.
发明人： Michele Boscolo Berto , Ezio Galbiati , Giuseppe Maiocchi
IPC分类号： G11B5/55
CPC分类号： G11B5/5534 , G11B5/5547 , G11B5/5565 , H02P6/182 , H02P25/028 , H02P25/034
摘要： A driver device coupled to a winding of an electro-mechanical actuator includes: a power stage driving the winding in a discontinuous mode by alternating conduction on-phases to off-phases, and a sensor circuit sensing a voltage across the winding in an off-phase, wherein, during such an off-phase the voltage across the winding includes a residual voltage which decays to zero. The power stage drives the winding from an on-phase to an off-phase by applying to the winding a reverse current pulse to invert the direction of flow of the current through the winding and produce an oscillation of the residual voltage, whereby the residual voltage includes a zero-crossing point after the current through the winding is exhausted. The sensor circuit senses the voltage across the winding at this zero-crossing point, whereby the voltage sensed across the winding at the zero-crossing point is indicative of the back electromotive force of the winding.

4. 发明授权

US09779773B1 Contact induced data storage device destruction 有权
公开(公告)号：US09779773B1
公开(公告)日：2017-10-03
申请号：US15417894
申请日：2017-01-27
申请人： Seagate Technology LLC
发明人： Timothy J. Courtney
IPC分类号： G11B15/04 , G11B20/00 , G11B5/55 , G11B5/56 , G11B5/00
CPC分类号： G11B20/00927 , G11B5/012 , G11B5/024 , G11B5/5547 , G11B5/6076
摘要： A data storage device may be destroyed by suspending a transducing head above a data storage medium prior to inducing contact of the transducing head with a first layer of the data storage medium in response to a signal from a controller. Deflection of the transducing head can then be increased to penetrate to a destroy depth in a second layer of the data storage medium that is maintained while the data storage medium spins. The controller may then issue at least one data read command to access data from the data storage medium and when a data read error is received, the data storage medium and transducing head can be verified as destroyed and incapable of accessing data previously written to the data storage medium.

5. 发明申请

US20170200470A1 MAGNETIC DISK DEVICE AND WRITE PROCESSING METHOD 有权
公开(公告)号：US20170200470A1
公开(公告)日：2017-07-13
申请号：US15087492
申请日：2016-03-31
申请人： Kabushiki Kaisha Toshiba
发明人： Shuuichi Kojima
IPC分类号： G11B20/18 , G06F3/06 , G11B5/55 , G06F11/10
CPC分类号： G11B20/1833 , G06F3/0619 , G06F3/064 , G06F3/0676 , G11B5/5534 , G11B5/5547 , G11B20/1217
摘要： According to one embodiment, a magnetic disk device includes a disk including a first recording area, a head includes a write head configured to write data to the disk, and a read head configured to read data from the disk, and a controller configured to set particular areas in same circumferential positions on tracks of the first recording area, and to write, to the respective particular areas, parity data based on data read from areas other than the particular areas.

6. 发明授权

US09558772B1 Position error signal (PES) detection 有权
标题翻译：位置误差信号（PES）检测
公开(公告)号：US09558772B1
公开(公告)日：2017-01-31
申请号：US14245902
申请日：2014-04-04
申请人： Seagate Technology LLC
发明人： Timothy Ellis , Thomas Zirps
IPC分类号： G11B5/596 , G11B5/55 , G11B5/012
CPC分类号： G11B5/5547 , G11B5/012 , G11B5/5521
摘要： Methods and apparatuses for modulating a position error signal detection gate signal responsive to a track crossing velocity are discussed. The position error signal can be used to detect position information. A track crossing velocity can be estimated and then used via the modulating. Phase errors due to the track crossing velocity can be minimized.
摘要翻译：讨论了响应于轨道交叉速度来调制位置误差信号检测门信号的方法和装置。位置误差信号可用于检测位置信息。可以估计轨道交叉速度，然后通过调制使用。由于轨道交叉速度导致的相位误差可以最小化。

7. 发明授权

US09424868B1 Data storage device employing spindle motor driving profile during seek to improve power performance 有权
标题翻译：数据存储装置在寻求提高功率性能的过程中采用主轴电机驱动轮廓
公开(公告)号：US09424868B1
公开(公告)日：2016-08-23
申请号：US14740098
申请日：2015-06-15
申请人： Western Digital Technologies, Inc.
发明人： Michael Troy Nicholls , Wei Xi , Jie Wan , Jie Yu , Jun Xu , Danny J. Kastler
IPC分类号： G11B15/46 , G11B19/02 , G11B5/55 , G11B5/52
CPC分类号： G11B5/5582 , G11B5/5547 , G11B19/22 , G11B19/26
摘要： A data storage device is disclosed comprising a spindle motor configured to rotate a disk, wherein the spindle motor comprises a plurality of windings, and a head actuated over the disk. The windings of the spindle motor are commutated based on a commutation sequence while applying a periodic driving voltage to each winding. During a seek operation to seek the head a seek length, an amplitude of the periodic driving voltage is adjusted according to a driving profile corresponding to the seek length, wherein the driving profile compensates for a power disturbance during the seek operation.
摘要翻译：公开了一种数据存储装置，其包括被配置为旋转盘的主轴电动机，其中所述主轴电动机包括多个绕组，以及在所述盘上致动的磁头。主轴电动机的绕组基于换向顺序进行换向，同时向每个绕组施加周期性的驱动电压。在寻找寻道长度的寻道操作期间，根据与寻道长度对应的驱动曲线来调整周期性驱动电压的幅度，其中驱动轮廓补偿寻道操作期间的功率扰动。

8. 发明授权

US09418689B2 Data storage device generating an operating seek time profile as a function of a base seek time profile 有权
标题翻译：数据存储装置产生作为基本寻道时间曲线的函数的操作搜索时间曲线
公开(公告)号：US09418689B2
公开(公告)日：2016-08-16
申请号：US14706881
申请日：2015-05-07
申请人： Western Digital Technologies, Inc.
发明人： Mingji Lou , Orhan Beker , Lu Feng
IPC分类号： G11B5/596 , G11B5/55
CPC分类号： G11B5/5547
摘要： A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of tracks. An operating seek time profile is generated as a function of a base seek time profile, wherein the seek time profiles define a seek time to seek the head radially over the disk by a seek length. A seek operation is executed to seek the head by a target seek length by at least generating a target seek time based on the target seek length and the operating seek time profile, and seeking the head the target seek length based on the target seek time.
摘要翻译：公开了一种数据存储装置，包括在包括多个轨道的盘上致动的头部。产生操作搜索时间曲线作为基本搜索时间曲线的函数，其中寻找时间曲线限定了寻找时间，以在盘上径向寻找头部寻找长度。执行寻道操作，通过至少基于目标寻找长度和操作查找时间曲线生成目标寻找时间，并且基于目标搜索时间寻找目标寻找长度来寻找目标寻找长度。

9. 发明申请

US20160180873A1 MAGNETIC DISK DEVICE AND DETERMINING METHOD OF CROSSING A ZONE BOUNDARY 有权
标题翻译：磁性盘装置及横截面的测定方法
公开(公告)号：US20160180873A1
公开(公告)日：2016-06-23
申请号：US14639008
申请日：2015-03-04
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Makoto Asakura
IPC分类号： G11B5/596
CPC分类号： G11B5/59616 , G11B5/5526 , G11B5/5547 , G11B20/10037 , G11B20/10222 , G11B2020/1242
摘要： According to one embodiment, a magnetic disk device includes a magnetic disk in which servo patterns with different writing frequencies are recorded and divided into a plurality of zones in a cross-track direction; a magnetic head that is provided for the magnetic disk; and a controller to determine whether the magnetic head cross a zone boundary between the zones of the servo patterns, according to a predicted position of the magnetic head that is corrected with reference to a phase shift time between the zones of the servo patterns.
摘要翻译：根据一个实施例，磁盘装置包括磁盘，其中记录具有不同写入频率的伺服模式并将其划分为跨轨道方向的多个区域; 设置在磁盘上的磁头; 以及控制器，用于根据参照伺服模式的区域之间的相移时间校正的磁头的预测位置来确定磁头是否与伺服模式的区域之间的区域边界交叉。

10. 发明授权

US09111560B1 Dynamic configuration of seek recovery in a disk drive 有权
标题翻译：动态配置磁盘驱动器中的寻找恢复
公开(公告)号：US09111560B1
公开(公告)日：2015-08-18
申请号：US14605076
申请日：2015-01-26
申请人： Seagate Technology LLC
发明人： GuoQing Zhang , Mingzhong Ding , KianKeong Ooi
IPC分类号： G11B5/55
CPC分类号： G11B5/5565 , G11B5/5547 , G11B5/5582
摘要： An apparatus comprises a controller configured to detect a seek failure of a read/write head. The controller is additionally configured to perform a seek recovery operation in accordance with a recovery sequence in response to the seek failure; the recovery sequence comprising a plurality of recovery procedures. Further, the controller is configured to determine if the seek recovery operation is successful and determine which of the recovery procedures provided the success. And, the controller is configured to dynamically calculate the success rate of each recovery procedure, modify the recovery sequence based on the success of the seek recovery operation and based on the success rate of recovery procedures providing the success.
摘要翻译：一种装置包括被配置为检测读/写头的寻找故障的控制器。所述控制器还被配置为响应于所述寻找故障，根据恢复顺序执行寻道恢复操作; 所述恢复序列包括多个恢复过程。此外，控制器被配置为确定寻求恢复操作是否成功，并确定提供成功的恢复过程中的哪一个。并且，控制器被配置为动态地计算每个恢复过程的成功率，基于寻求恢复操作的成功并基于提供成功的恢复过程的成功率来修改恢复序列。

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