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1. 发明授权

US09818439B1 Determining gamma of a read/write head based on active gain control and test signal amplitude measurements 有权
公开(公告)号：US09818439B1
公开(公告)日：2017-11-14
申请号：US15073848
申请日：2016-03-18
申请人： Seagate Technology LLC
发明人： Jason Riddering , Huazhou Lou
IPC分类号： G11B5/60 , G11B5/012 , G11B20/10 , G11B5/00 , G11B5/48 , G11B19/04
CPC分类号： G11B5/6029 , G11B5/012 , G11B5/4866 , G11B5/6011 , G11B5/607 , G11B5/6088 , G11B19/046 , G11B20/10314 , G11B20/10388 , G11B2005/0021
摘要： A change in servo active gain control values is determined from a beginning of a writing of a test region of a recording medium to an end of the writing of the test region. The servo active gain control values are read from servo marks by a read transducer of a read/write head during the writing. After writing of the test region, the test region is read by the read transducer to determine a change in recorded amplitude from the beginning of the writing to the end of the writing. A gamma value of the read/write head is determined based on the change in servo active gain control values and the change in recorded amplitude.

2. 发明授权

US09595279B1 Accelerating thermal decay of a harmonic-ratio reference track 有权
标题翻译：加速谐波比参考轨道的热衰减
公开(公告)号：US09595279B1
公开(公告)日：2017-03-14
申请号：US14925105
申请日：2015-10-28
申请人： Seagate Technology LLC
发明人： Richard Edward Martin
IPC分类号： G11B21/02 , G11B5/60
CPC分类号： G11B5/6029 , G11B5/607
摘要： A reference track written to a magnetic recording medium includes at least two harmonics that facilitate measuring a clearance between a read/write head and the recording medium. A magnetic field is applied to the reference track that accelerates a thermal decay of the reference track without erasing data of the reference track.
摘要翻译：写入磁记录介质的参考轨道包括至少两个谐波，其便于测量读/写头与记录介质之间的间隙。将磁场施加到参考轨道，加速参考轨道的热衰减，而不擦除参考轨道的数据。

3. 发明授权

US09251829B2 Head DFH protrusion shape calibration by HDI sensor 有权
公开(公告)号：US09251829B2
公开(公告)日：2016-02-02
申请号：US13317402
申请日：2011-10-17
申请人： Siu Yin Ngan , Qinghua Zeng , Ellis Cha
发明人： Siu Yin Ngan , Qinghua Zeng , Ellis Cha
IPC分类号： G11B5/60 , G11B27/36
CPC分类号： G11B5/607 , G11B5/6011 , G11B5/6029 , G11B5/6076 , G11B27/36 , G11B2220/2516
摘要： Dynamic fly height (DFH) controlled read/write heads using multiple heaters have their heater powers set within a range of ratios that allows minimum clearances to be set between the read-gap and the write-gap and the surface of a disk, thereby providing improved touch-down detection. Determining the correct range of power ratios requires varying the ratio to create an adjustable protrusion profile for the read and write elements in the head and measuring values of the ratio and corresponding values of read gap and write gap clearances that create points of minimum clearance. By adjusting the ratio of power supplied to the heaters, different protrusion profiles can be produced, clearance control for sigma reduction can be obtained and read/write readiness and operation consistency and reliability can be improved.

4. 发明授权

US09123386B2 Data storage system and a method for measuring a change in a spacing between a head and a storage medium of a data storage system 有权
标题翻译：数据存储系统以及用于测量数据存储系统的头部和存储介质之间间隔的变化的方法
公开(公告)号：US09123386B2
公开(公告)日：2015-09-01
申请号：US13666118
申请日：2012-11-01
申请人： Agency for Science, Technology and Research
发明人： Zhimin Yuan , Bo Liu , Shengbin Hu , Chun Lian Ong
IPC分类号： G11B5/60 , G11B27/36
CPC分类号： G11B27/36 , G11B5/6011 , G11B5/6029 , G11B5/607
摘要： A method for measuring a change in a spacing between a head and a storage medium of a data storage system. The method includes obtaining a first readback signal from the storage medium using the head at a first spacing between the head and the storage medium, determining a first power spectrum density over a frequency range from the obtained first readback signal, obtaining a second readback signal from the storage medium using the head at a second spacing between the head and the storage medium, determining a second power spectrum density over the frequency range from the obtained second readback signal, and providing a measurement indicative of the change in the spacing based on the determined first power spectrum density and the determined second power spectrum density. A data storage system is also provided.
摘要翻译：一种用于测量数据存储系统的头部和存储介质之间的间隔的变化的方法。该方法包括使用头部以头部和存储介质之间的第一间隔从存储介质获得第一回读信号，从获得的第一回读信号确定频率范围上的第一功率谱密度，从第所述存储介质以所述头部和所述存储介质之间的第二间隔使用所述头部，从所获得的第二回读信号确定所述频率范围上的第二功率谱密度，并且基于所确定的所述第二回读信号提供指示所述间隔的变化的测量值第一功率谱密度和确定的第二功率谱密度。还提供了数据存储系统。

5. 发明授权

US09070416B2 Methods and apparatus for hard disk drive system operation monitoring and self-adjustment 有权
标题翻译：硬盘驱动系统运行监控和自我调整的方法和装置
公开(公告)号：US09070416B2
公开(公告)日：2015-06-30
申请号：US13891735
申请日：2013-05-10
申请人： MARVELL INTERNATIONAL LTD.
发明人： Budi Santoso , Zhimin Yuan , Siang Huei Leong , Chun Lian Ong , Pantelis Alexopoulos
IPC分类号： G11B27/36 , G11B5/09 , G11B21/02 , G11B19/04 , G11B5/60
CPC分类号： G11B5/09 , G11B5/6029 , G11B19/048 , G11B27/36
摘要： Methods and architecture for monitoring hard disk drive operation is provided. The hard disk drive system provided includes a spindle, a head and a disk with a disk medium including a buried servo layer having a first frequency of data on a first track and a second frequency of data on a second track, the second track adjacent to the first track. The method includes the steps of writing a wide track pattern having a predetermined frequency on a track of a hard disk drive medium, generating a readback signal by reading the pattern from the track, processing the readback signal by mixing the readback signal with a reference signal to obtain a mixed signal having a summed signal and a difference signal, and filtering the mixed signal by a filter centered around the difference signal to generate a measurement signal corresponding to a relative speed change of the spindle and a head-to-disk motion. In addition, filtering a readback signal generated by the head when positioned at the middle of the first track and the second track with a first filter centered at the first frequency and a second filter centered at the second frequency is used to generate signals for determining spindle speed variation, spindle speed jitter, and relative head-disk vibration in the downtrack direction, for synchronizing writing in Two Dimensional Magnetic Recording (TDMR) and for measuring continuous flying height information based on Wallace equations.
摘要翻译：提供了监控硬盘驱动器操作的方法和架构。提供的硬盘驱动器系统包括主轴，磁头和磁盘，磁盘介质包括在第一磁道上具有第一数据频率的掩埋伺服层和在第二磁道上的第二数据频率的第二磁道，第一轨。该方法包括以下步骤：在硬盘驱动器介质的轨道上写入具有预定频率的宽轨道图案，通过从轨道读取图案产生回读信号，通过将回读信号与参考信号混合来处理回读信号以获得具有加和信号和差分信号的混合信号，并且通过以差分信号为中心的滤波器对混合信号进行滤波，以产生对应于主轴的相对速度变化和头对盘运动的测量信号。此外，当位于第一轨道的中间处的头部产生的回读信号和以第一频率为中心的第一滤波器的第二轨道和以第二频率为中心的第二滤波器进行滤波，以产生用于确定主轴的信号速度变化，主轴转速抖动以及沿横向方向的相对头盘振动，用于在二维磁记录（TDMR）中同步写入以及基于Wallace方程测量连续飞行高度信息。

6. 发明授权

US09053749B1 Disk drive comprising a per-drive and per-head fly height filter 有权
标题翻译：磁盘驱动器包括每驱动器和每头飞高度过滤器
公开(公告)号：US09053749B1
公开(公告)日：2015-06-09
申请号：US13840225
申请日：2013-03-15
申请人： Western Digital Technologies, Inc.
发明人： Phillip S. Haralson , Kent D. Anderson
IPC分类号： G11B21/02 , G11B27/36 , G11B21/21 , G11B5/60
CPC分类号： G11B27/36 , G11B5/5534 , G11B5/6011 , G11B5/6029
摘要： A disk drive is disclosed comprising a plurality of disk surfaces, and a head actuated over each disk surface, where each head comprises a fly height actuator (FHA) operable to control a fly height of the head over the corresponding disk surface. A fly height is measured for each head to generate a plurality of fly height measurements. An average value is generated in response to the plurality of fly height measurements, and a first control value is generated for a first head based on the average value and the fly height measurement for the first head. The first FHA of the first head is controlled in response to the first control value.
摘要翻译：公开了一种盘驱动器，其包括多个盘表面，以及在每个盘表面上致动的头，其中每个头包括飞行高度致动器（FHA），其可操作以控制头部在相应的盘表面上的飞行高度。测量每个头部的飞行高度以产生多个飞行高度测量值。响应于多个飞行高度测量而产生平均值，并且基于第一头的平均值和飞行高度测量为第一头产生第一控制值。响应于第一控制值来控制第一头的第一FHA。

7. 发明授权

US09042047B1 Mitigating write faults arising from disturbed lubrication events 有权
标题翻译：缓解因扰动的润滑事件引起的写入故障
公开(公告)号：US09042047B1
公开(公告)日：2015-05-26
申请号：US14506315
申请日：2014-10-03
申请人： Seagate Technology LLC
发明人： Mark Gerald Dubé
IPC分类号： G11B5/02 , G11B5/012
CPC分类号： G11B5/012 , G11B5/59694 , G11B5/6029 , G11B20/1883
摘要： Apparatus and method for detecting and compensating for lubrication disturbance (lube disturb) events on a rotatable data recording medium. In some embodiments, a lube disturb event is detected responsive to displacement of a data transducer away from a first memory location on a rotating data recording medium during a write operation to write data thereto. The lube disturb event arises responsive to a transfer of accumulated contamination from a data transducer to a lubrication layer on the rotating data recording medium and a smearing of the transferred accumulated contamination along the first memory location. The write data are stored to a different, second memory location instead of to the first memory location responsive to the detected lube disturb event.
摘要翻译：用于检测和补偿可旋转数据记录介质上的润滑干扰（润滑油干扰）事件的装置和方法。在一些实施例中，响应于在写入操作期间数据换能器远离旋转数据记录介质上的第一存储器位置的位移来检测润滑油干扰事件以向其写入数据。润滑油扰乱事件响应于从数据传感器到旋转数据记录介质上的润滑层的累积污染物的转移以及沿着第一存储器位置的转移的累积污染物的污染。写入数据被存储到不同的第二存储器位置，而不是响应于检测到的润滑油扰动事件而存储到第一存储器位置。

8. 发明授权

US08976633B1 Data storage device calibrating fly height actuator based on laser power for heat assisted magnetic recording 有权
标题翻译：数据存储装置根据用于热辅助磁记录的激光功率校准飞行高度执行器
公开(公告)号：US08976633B1
公开(公告)日：2015-03-10
申请号：US14253491
申请日：2014-04-15
申请人： Western Digital Technologies, Inc.
发明人： Huanxiang Ruan , Galvin T. Chia
IPC分类号： G11B11/00 , G11B13/04 , G11B5/60 , G11B5/00
CPC分类号： G11B5/607 , G11B5/5534 , G11B5/6029 , G11B5/6076 , G11B2005/0021
摘要： A data storage device is disclosed comprising a disk, a head comprising a laser configured to heat the disk while writing data to the disk, and a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting. A write laser power applied to the laser during a write operation is calibrated, a first fly height of the head is measured at a first laser power setting, and a second fly height of the head is measured at a second laser power setting different from the first laser power setting. A FHA write setting is generated based on the calibrated write laser power and the first and second fly height measurements, where the FHA write setting is applied to the FHA during the write operation.
摘要翻译：公开了一种数据存储设备，其包括盘，头部，其包括被配置为在将数据写入盘的同时加热盘的激光器;以及飞行高度致动器（FHA），其被配置为基于FHA设置在盘上垂直驱动头部。在写入操作期间施加到激光器的写入激光功率被校准，在第一激光功率设置下测量头部的第一飞行高度，并且以与第二激光功率设定不同的第二激光功率设置来测量头部的第二飞行高度第一激光功率设定。基于校准的写入激光功率和第一和第二飞行高度测量值生成FHA写入设置，其中在写入操作期间将FHA写入设置应用于FHA。

9. 发明授权

US08947814B2 Collection of readback signal modulation data 有权
标题翻译：收集回读信号调制数据
公开(公告)号：US08947814B2
公开(公告)日：2015-02-03
申请号：US13861976
申请日：2013-04-12
申请人： Seagate Technology LLC
发明人： Bruce Douglas Emo
IPC分类号： G11B5/02 , G11B21/02 , G11B5/60 , G11B5/596 , G11B5/40 , G11B5/455 , G11B19/04
CPC分类号： G11B21/02 , G11B5/40 , G11B5/455 , G11B5/59622 , G11B5/6005 , G11B5/6029 , G11B5/6076 , G11B19/048
摘要： A data storage system having a read channel configured to function in a normal operation mode and a test mode. In the normal operation mode, the read channel is configured to decode a readback signal to obtain data bits. In the test mode, the read channel is configured to extract gain control loop data and/or timing control loop data from the readback signal.
摘要翻译：一种具有被配置为在正常操作模式和测试模式下起作用的读通道的数据存储系统。在正常操作模式下，读通道被配置为解码回读信号以获得数据位。在测试模式中，读取通道被配置为从回读信号中提取增益控制环路数据和/或定时控制环路数据。

10. 发明申请

US20140254344A1 Contact Detection 审中-公开
标题翻译：接触检测
公开(公告)号：US20140254344A1
公开(公告)日：2014-09-11
申请号：US14282176
申请日：2014-05-20
申请人： Seagate Technology LLC
发明人： Dongming Liu , Lin Zhou , Adam Karl Himes , Lee Clifford Knippenberg , Michael Thomas Johnson
IPC分类号： G11B5/60
CPC分类号： G11B5/6029 , G11B5/6005 , G11B5/6011 , G11B5/607 , G11B5/6076 , G11B27/36 , G11B2220/2516
摘要： A method of detecting a contact between a transducing head and a storage medium is provided. The method applies an input signal, having a select power level and known frequency, to an actuator for actuating the head. An output signal is obtained in response to the input signal. At least one signal component is extracted from the output signal at the same or a harmonic of the same known frequency as the input signal applied to the actuator. Whether the at least one extracted signal component indicates a contact between the head and the medium is determined. The power level of the applied wave pattern is increased incrementally until the extracted signal component indicates a contact between the head and the storage medium.
摘要翻译：提供了一种检测换能头与存储介质之间的接触的方法。该方法将具有选择功率电平和已知频率的输入信号施加到用于致动头部的致动器。响应于输入信号获得输出信号。以与施加到致动器的输入信号相同的已知频率的相同或谐波从输出信号提取至少一个信号分量。确定至少一个提取的信号分量是否指示头部和介质之间的接触。所施加的波形图案的功率电平逐渐增加，直到提取的信号分量表示头部和存储介质之间的接触。

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