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1. 发明授权

US09640211B1 Servo track encoding and decoding 有权
公开(公告)号：US09640211B1
公开(公告)日：2017-05-02
申请号：US15151237
申请日：2016-05-10
申请人： Seagate Technology LLC
发明人： Philip L. Steiner , Bruce Douglas Buch
IPC分类号： G11B5/09 , G11B5/02 , G11B5/596
CPC分类号： G11B5/59688 , G11B5/59633 , G11B20/1407 , G11B2020/1484
摘要： A system includes a memory, a processor, an encoder, a head, and a decoder. The memory stores information. The processor processes information and controls operation of other components. The encoder encodes a first portion and a second portion of a servo track to form a first and second encoded values. The second code has a run length associated therewith. The first and second encoded values result in a Gray code. Each bit of the Gray code remains constant for at least a number of tracks corresponding to the run length. The head is configured to write the first and the second encoded values onto a media, and is configured to read the first and the second encoded values from the media. The decoder decodes the first encoded value and the second encoded value. The processor determines a servo track address from the decoded first value and the decoded second value.

2. 发明授权

US09514775B2 Reducing effect of frequency acquisition error in a position error signal responsive to split servo burst patterns 有权
标题翻译：响应于分离的伺服脉冲串模式，在位置误差信号中减小频率采集误差的影响
公开(公告)号：US09514775B2
公开(公告)日：2016-12-06
申请号：US12357168
申请日：2009-01-21
申请人： Richard Lyle Keizer , Mustafa Can Ozturk , Puskal Prasad Pokharel
发明人： Richard Lyle Keizer , Mustafa Can Ozturk , Puskal Prasad Pokharel
IPC分类号： G11B5/596
CPC分类号： G11B5/59688
摘要： In a servo control loop, servo burst signals that are read from a plurality of servo burst patterns that include a split servo burst pattern contain frequency acquisition error. The frequency acquisition error is at least partially removed to generate a frequency acquisition error compensated position error signal (PES).
摘要翻译：在伺服控制环路中，从包括分离伺服脉冲串图形的多个伺服脉冲串图形读出的伺服脉冲信号包含频率采集误差。频率采集误差至少部分被去除以产生频率采集误差补偿位置误差信号（PES）。

3. 发明授权

US09472223B1 Media certification with different recording widths 有权
标题翻译：具有不同记录宽度的媒体认证
公开(公告)号：US09472223B1
公开(公告)日：2016-10-18
申请号：US14848552
申请日：2015-09-09
申请人： Seagate Technology LLC
发明人： Riyan Alex Mendonsa , Wenzhong Zhu , Kaizhong Gao , Edward C Gage
IPC分类号： G11B5/09 , G11B5/596 , G11B20/18
CPC分类号： G11B5/59638 , G11B5/012 , G11B5/59688 , G11B20/1816 , G11B2005/0021
摘要： Systems and methods are disclosed to perform media certification with different recording widths, in accordance with certain embodiments of the present disclosure. An apparatus may be configured to record data using at least two selectable recording widths. In some embodiments, the recording width may be controlled by adjusting a laser current supplied to a laser emitter of a heat assisted magnetic recording (HAMR) device. Certification data may be recorded to a storage medium at a selected recording width, with wider widths reducing testing time and narrower widths reducing wear on write heads. In some embodiments, an apparatus may be configured to record servo data using a first recording width to a storage medium, and record certification data using a second recording width. The drive may record servo data and certification during a first disc rotation, and may record servo data and read certification data during a second disc rotation.
摘要翻译：根据本公开的某些实施例，公开了系统和方法来执行具有不同记录宽度的媒体认证。设备可以被配置为使用至少两个可选择的记录宽度来记录数据。在一些实施例中，记录宽度可以通过调节提供给热辅助磁记录（HAMR）装置的激光发射器的激光电流来控制。认证数据可以以选定的记录宽度被记录到存储介质，具有更宽的宽度，减少了测试时间和较窄的宽度，从而减小了写入头上的磨损。在一些实施例中，装置可以被配置为使用第一记录宽度将伺服数据记录到存储介质，并且使用第二记录宽度记录认证数据。驱动器可以在第一盘旋转期间记录伺服数据和认证，并且可以在第二盘旋转期间记录伺服数据和读取认证数据。

4. 发明授权

US09324369B2 Data recording medium and method for generating a reference clock signal 有权
标题翻译：用于产生参考时钟信号的数据记录介质和方法
公开(公告)号：US09324369B2
公开(公告)日：2016-04-26
申请号：US14580911
申请日：2014-12-23
申请人： Marvell International Ltd.
发明人： Jingliang Zhang , Lin Lin Thi , Zhimin Yuan , Bo Liu
IPC分类号： G11B5/596 , G11B20/14 , G11B27/30 , G11B7/2403 , G11B27/24 , G11B20/12
CPC分类号： G11B20/14 , G11B5/59655 , G11B5/59688 , G11B7/2403 , G11B20/1217 , G11B27/24 , G11B27/3063 , G11B2020/1238 , G11B2220/235 , G11B2220/2508
摘要： Various embodiments provide a recording medium. The recording medium may include a dedicated servo layer for providing servo information. The dedicated servo layer may include a plurality of tracks. A first track may include a first servo signal. A second track may include a second servo signal. The first servo signal and the second servo signal may include a plurality of common transitions. The transitions may be provided at a pre-determined frequency.
摘要翻译：各种实施例提供记录介质。记录介质可以包括用于提供伺服信息的专用伺服层。专用伺服层可以包括多个轨道。第一轨道可以包括第一伺服信号。第二轨道可以包括第二伺服信号。第一伺服信号和第二伺服信号可以包括多个公共转变。可以以预定频率提供转换。

5. 发明授权

US09286927B1 Data storage device demodulating servo burst by computing slope of intermediate integration points 有权
标题翻译：数据存储设备通过计算中间积分点的斜率来解调伺服脉冲串
公开(公告)号：US09286927B1
公开(公告)日：2016-03-15
申请号：US14571461
申请日：2014-12-16
申请人： Western Digital Technologies, Inc.
发明人： Shan Tang , Zhenyu Zhang , Chuanwen Ji , Duc T. Phan
IPC分类号： G11B5/596 , G11B20/00
CPC分类号： G11B5/59655 , G11B5/59688 , G11B20/00963 , G11B20/10009
摘要： A data storage device is disclosed comprising a head actuated over a disk surface comprising tracks defined by servo sectors, wherein each servo sector comprises at least one servo burst comprising a periodic pattern. The servo burst of one of the servo sectors is read to generate a read signal, and M intermediate integration points yNi are computed according to: y N i = ∑ k = 0 N i ⁢ r ⁡ ( k ⁢ ⁢ T s ) · sin ⁡ ( ω ⁢ ⁢ k ⁢ ⁢ T s ) ; i = 0 , 1 , … ⁢ , M - 1 where r(kTs) represents a sample point of the read signal, Ts represents a sample interval between the sample points, and ω represents a frequency of the periodic pattern in the servo burst.
摘要翻译：公开了一种数据存储装置，包括在包括由伺服扇区定义的轨道的磁盘表面上致动的磁头，其中每个伺服扇区包括至少一个包括周期性模式的伺服脉冲串。读取伺服扇区之一的伺服脉冲以产生读取信号，并且根据以下公式计算M个中间积分点yNi：y N i =＆Sigma; k = 0 N i r＆CenterDot;（k，T s）·sin ⁡（ωTPSk？T s）; i = 0,1，...，M-1其中r（kTs）表示读取信号的采样点，Ts表示采样点之间的采样间隔，ω表示伺服脉冲串中周期性模式的频率。

6. 发明授权

US09286926B1 Two-dimensional magnetic recording (TDMR) disk drive with varying servo track pitch 有权
标题翻译：具有不同伺服磁道间距的二维磁记录（TDMR）磁盘驱动器
公开(公告)号：US09286926B1
公开(公告)日：2016-03-15
申请号：US14834683
申请日：2015-08-25
申请人： HGST Netherlands B.V.
发明人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba , Gary Allan Herbst
IPC分类号： G11B21/02 , G11B5/596
CPC分类号： G11B5/59627 , G11B5/59688
摘要： A two-dimensional magnetic recording (TDMR) disk drive has a disk with servo tracks with a track pitch that varies across the radius of the disk. The servo track pitch (STP) is related to the cross-track spacing (CTS) of the multiple read sensors in the TDMR head structure. The CTS is given by the equation: CTS=(CTO)cos θ+(ATO)sin θ, where θ is the skew angle, and CTO is the cross-track spacing and ATO the along-the-track spacing of the read sensors at zero skew angle. The optimal variable STP profile results in track misregistration reduction because it allows each read sensor to read a different servo half-track and thus noise sources not correlated to noise sources read by the other read sensors. The servo tracks may be arranged into a plurality of annular bands, with the STP in each band being fixed and different from the STP in the other bands.
摘要翻译：二维磁记录（TDMR）磁盘驱动器具有磁盘，其具有在磁盘半径上变化的磁道间距的伺服磁道。伺服磁道间距（STP）与TDMR磁头结构中的多个读取传感器的交叉磁道间隔（CTS）有关。 CTS由下式给出：CTS =（CTO）cos＆Thetas; +（ATO）sin＆thetas;其中＆thetas; 是倾斜角度，CTO是零倾斜角度下读取传感器的轨道间距和ATO沿轨道间距。最佳可变STP曲线导致轨道配准减小，因为它允许每个读取传感器读取不同的伺服半轨迹，并因此读取与其它读取传感器读取的噪声源不相关的噪声源。伺服磁道可以被布置成多个环带，其中每个频带中的STP是固定的，并且与其它频带中的STP不同。

7. 发明授权

US09251857B2 Method of predicting a noise component associated with a readback signal from a dedicated servo medium, noise predictor thereof, and hard disk drive system 有权
标题翻译：用于预测与来自专用伺服介质的回读信号相关联的噪声分量，其噪声预测器和硬盘驱动系统的方法
公开(公告)号：US09251857B2
公开(公告)日：2016-02-02
申请号：US14697009
申请日：2015-04-27
申请人： Marvell International LTD.
发明人： Yibin Ng , Kheong Sann Chan , Anmin Kong
IPC分类号： G11B27/36 , G11B20/10 , G11B5/012 , G11B20/12
CPC分类号： G11B27/36 , G11B5/012 , G11B5/59616 , G11B5/59688 , G11B20/10009 , G11B20/10268 , G11B20/10305 , G11B20/10388 , G11B20/10462 , G11B20/1252 , G11B2020/1281 , G11B2220/20 , G11B2220/2516
摘要： There is provided a method of predicting a noise component associated with a readback signal in a channel from a dedicated servo medium including a data recording layer and a dedicated servo layer. The method including: providing at least one noise prediction module for each of a plurality of types of servo patterns of the servo layer, and predicting the noise component by, for each of a plurality of segments of the readback signal of the data recording layer, using a selected one of the noise prediction modules. In particular, the selected one of the noise prediction module for a segment of the readback signal is selected based on the type of the servo pattern associated with the segment of the readback signal. There is also provided a corresponding noise predictor, a method of detecting data bits from the readback signal, and a hard disk drive system.
摘要翻译：提供了一种在包括数据记录层和专用伺服层的专用伺服介质的通道中预测与回读信号相关联的噪声成分的方法。该方法包括：为伺服层的多种伺服模式中的每一种提供至少一个噪声预测模块，并且通过对于数据记录层的回读信号的多个段中的每一个段预测噪声分量，使用所选择的一个噪声预测模块。具体地，基于与回读信号的段相关联的伺服模式的类型来选择用于回读信号的段的噪声预测模块中所选择的一个。还提供了相应的噪声预测器，从回读信号检测数据位的方法和硬盘驱动器系统。

8. 发明授权

US09224420B1 Syncmark detection failure recovery system 有权
标题翻译： Syncmark检测故障恢复系统
公开(公告)号：US09224420B1
公开(公告)日：2015-12-29
申请号：US14505479
申请日：2014-10-02
申请人： Avago Technologies General IP (Singapore) Pte. Ltd.
发明人： Yuqing Yang , Shaohua Yang , Lei Wang , Xiao Jun Wang
IPC分类号： G11B20/10 , G06F11/10 , G11B20/12 , G11B5/596
CPC分类号： G11B20/10222 , G06F11/1076 , G11B5/59616 , G11B5/59655 , G11B5/59688 , G11B20/10 , G11B20/10009
摘要： An apparatus for finding a syncmark in a data sector includes a syncmark detection circuit, decoder, fragment information table and syncmark recovery circuit. The syncmark detection circuit is operable to detect a syncmark in each of a number of fragments of the data sector and to compute a syncmark quality for each of the syncmarks. The decoder is operable to apply a data decoding algorithm to encoded data for the data sector. The encoded data has start points identified by the syncmark in each of the fragments. The fragment information table stores the syncmark quality for each of the syncmarks. The syncmark recovery sweeps the start points over search ranges for selected fragments for which the syncmark detection circuit failed to detect the syncmark and which have a lower syncmark quality than others of the fragments.
摘要翻译：用于在数据扇区中找到同步标记的装置包括同步标记检测电路，解码器，片段信息表和同步标记恢复电路。同步标记检测电路可操作以检测数据扇区的多个片段中的每一个中的同步标记，并计算每个同步标记的同步标记质量。解码器可操作以将数据解码算法应用于数据扇区的编码数据。编码数据具有由每个片段中的同步标记识别的起始点。片段信息表存储每个同步标记的同步标记质量。同步标记恢复扫描搜索范围内的起始点，其中标记检测电路检测到同步标记失败，并且具有比其他片段更低的同步标记质量。

9. 发明申请

US20150356988A1 PROCESSING SERVO DATA FROM TWO OR MORE READ TRANSDUCERS CO-LOCATED ON A SLIDER 审中-公开
标题翻译：从两个或更多读取传感器处理服务器数据，位于滑动器上
公开(公告)号：US20150356988A1
公开(公告)日：2015-12-10
申请号：US14803274
申请日：2015-07-20
申请人： Seagate Technology LLC
发明人： Puskal Prasad Pokharel , Riyan Mendonsa
IPC分类号： G11B5/596 , G11B20/12 , G11B20/10
CPC分类号： G11B5/59688 , G11B5/596 , G11B5/59627 , G11B5/6005 , G11B20/10388 , G11B20/1217 , G11B2020/1241
摘要： Two or more signals are read from two or more respective tracks of a disk drive recording medium using respective two or more read transducers co-located on a slider. The slider is aligned to the two or more tracks in response to the correlation between the two or more signals.
摘要翻译：使用共同位于滑动器上的相应的两个或更多个读取换能器，从盘驱动器记录介质的两个或更多个相应磁道读取两个或更多个信号。响应于两个或更多个信号之间的相关性，滑块与两个或更多个轨迹对准。

10. 发明授权

US09177581B2 Head position demodulation method and magnetic disk device 有权
标题翻译：磁头位置解调方法和磁盘装置
公开(公告)号：US09177581B2
公开(公告)日：2015-11-03
申请号：US14194482
申请日：2014-02-28
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Tomoyoshi Yamada
IPC分类号： G11B20/06 , G11B21/02 , G11B5/58 , G11B5/596 , G11B5/48
CPC分类号： G11B5/59688 , G11B5/4886
摘要： According to one embodiment, at demodulation of an A-phase burst pattern and a B-phase burst pattern arranged in a down-track direction so as to be different from each other in phase in a cross-track direction, the demodulated position of a magnetic head is calculated based on a sin component and a cos component in the A-phase burst pattern and a sin component and a cos component in the B-phase burst pattern.
摘要翻译：根据一个实施例，在A相脉冲串模式和布置在下行方向上以在交叉磁道方向上彼此相位不同的A相脉冲串模式和B相脉冲串模式的解调时，解调位置基于A相脉冲串图形中的sin分量和cos分量以及B相脉冲串图案中的sin分量和cos分量来计算磁头。

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