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1. 发明申请

US20180114540A1 ACCURATE REPEATABLE RUNOUT COMPENSATION IN DISK DRIVES DURING SEEKS 有权
公开(公告)号：US20180114540A1
公开(公告)日：2018-04-26
申请号：US15331380
申请日：2016-10-21
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Gabor SZITA , Jiangang LIANG
IPC分类号： G11B5/596 , G11B20/18
CPC分类号： G11B5/59661 , G11B5/59627 , G11B5/59644 , G11B5/59666 , G11B20/10509
摘要： A repeatable runout (RRO) is accurately compensated for while moving a magnetic head radially across a disk surface. An iterative learning control algorithm is employed to determine appropriate feed-forward coefficients for an RRO compensation signal for each of a plurality of radial locations across the disk surface. The feed-forward coefficients are determined by performing multiple iterations of continuously moving the magnetic head across the disk surface along a target path while measuring a position error signal that indicates the radial error between the magnetic head and the target path. With each iteration, the iterative learning control algorithm computes new feed-forward coefficients for each of the plurality of radial locations, where the new feed-forward coefficients are selected to reduce the measured position error signal when employed to move the magnetic head along the target path.

2. 发明授权

US09953672B1 Accurate repeatable runout compensation in disk drives during seeks 有权
公开(公告)号：US09953672B1
公开(公告)日：2018-04-24
申请号：US15331380
申请日：2016-10-21
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Gabor Szita , Jiangang Liang
IPC分类号： G11B5/596 , G11B20/18
CPC分类号： G11B5/59661 , G11B5/59627 , G11B5/59644 , G11B5/59666 , G11B20/10509
摘要： A repeatable runout (RRO) is accurately compensated for while moving a magnetic head radially across a disk surface. An iterative learning control algorithm is employed to determine appropriate feed-forward coefficients for an RRO compensation signal for each of a plurality of radial locations across the disk surface. The feed-forward coefficients are determined by performing multiple iterations of continuously moving the magnetic head across the disk surface along a target path while measuring a position error signal that indicates the radial error between the magnetic head and the target path. With each iteration, the iterative learning control algorithm computes new feed-forward coefficients for each of the plurality of radial locations, where the new feed-forward coefficients are selected to reduce the measured position error signal when employed to move the magnetic head along the target path.

3. 发明授权

US09824708B2 Spiral write launch while servoing on reference guide spirals 有权
公开(公告)号：US09824708B2
公开(公告)日：2017-11-21
申请号：US14675482
申请日：2015-03-31
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Jiangang Liang , Gabor Szita , Tony Huang , Gary W. Calfee
IPC分类号： G11B5/596 , G11B20/12 , G11B5/55
CPC分类号： G11B5/59661 , G11B5/5543 , G11B5/59666 , G11B20/1217 , G11B2020/1238 , G11B2020/1281
摘要： A reference spiral is written on a recording surface of a hard disk drive. By launching writing of fine guide spirals from a launch point that is disposed on a pre-existing coarse guide spiral, writing of the fine guide spiral can be launched in response to a write head crossing the pre-existing coarse guide spiral, rather than in response to a precisely timed event. To enable launch points being disposed on pre-existing coarse guide spirals, launch points are not all located at the same radial position on the recording surface.

4. 发明申请

US20160232929A1 MAGNETIC DISK, METHOD OF TRACK FOLLOWING ON A MAGNETIC DISK AND METHOD OF WRITING A SERVO PATERN IN A DEDICATED SERVO LAYER OF A MAGNETIC DISK 有权
标题翻译：磁性磁盘，磁盘上的跟踪方法和在磁盘的专用服务器中写入服务器的方法
公开(公告)号：US20160232929A1
公开(公告)日：2016-08-11
申请号：US15022483
申请日：2014-09-17
申请人： MARVELL INTERNATIONAL LTD.
发明人： Zhimin YUAN , Jingliang ZHANG , Chun Lian ONG , Shiming ANG
IPC分类号： G11B5/596
CPC分类号： G11B5/59666 , G11B5/59655
摘要： Magnetic disk, method of track following on a magnetic disk, and method of writing a servo pattern in a dedicated servo layer of a magnetic disk. The magnetic disk comprises a servo pattern in a dedicated servo layer of the magnetic disk, the servo pattern having a first burst A and a second burst B arranged to be within one period of a servo sample, each of burst A and burst B comprising DC+ and DC− magnetic bursts; wherein a center of the DC+/DC− bursts of burst B is shifted relative to the DC+/DC− bursts of burst A in a substantially radial direction of the magnetic disk.
摘要翻译：磁盘，磁盘跟踪方法，以及将伺服模式写入磁盘的专用伺服层中的方法。磁盘包括在磁盘的专用伺服层中的伺服模式，伺服模式具有布置成在伺服采样的一个周期内的第一脉冲串A和第二脉冲串B，每个脉冲串A和脉冲串B包括DC + 和直流磁脉冲; 其中突发B的DC + / DC突发的中心相对于磁盘的大致径向方向上的突发A的DC + / DC脉冲串移位。

5. 发明授权

US09208810B1 Data storage device attenuating interference from first spiral track when reading second spiral track 有权
标题翻译：数据存储设备在读取第二个螺旋轨道时会衰减第一个螺旋轨道的干扰
公开(公告)号：US09208810B1
公开(公告)日：2015-12-08
申请号：US14560407
申请日：2014-12-04
申请人： Western Digital Technologies, Inc.
发明人： Jianbin Nie , Charles A. Park , Brian P. Rigney , Siri S. Weerasooriya
IPC分类号： G11B5/02 , G11B5/596
CPC分类号： G11B5/59666 , G11B5/59661
摘要： A data storage device is disclosed comprising a disk surface comprising a first spiral track at least partially overwritten by a second spiral track, and a head actuated over the disk surface based on the second spiral track. The first spiral track comprises a periodic pattern written at a first frequency, and the second spiral track comprises a periodic pattern written at a second frequency different from the first frequency.
摘要翻译：公开了一种数据存储装置，其包括盘表面，该盘表面包括至少部分地被第二螺旋形轨迹覆盖的第一螺旋轨道，以及基于第二螺旋轨道在盘表面上致动的头。第一螺旋轨道包括以第一频率写入的周期性图案，并且第二螺旋轨道包括以与第一频率不同的第二频率写入的周期性图案。

6. 发明申请

US20150340063A1 Radially-Coherent Reading and Writing System and Method for a Magnetic Disk 有权
标题翻译：径向相干读写系统和磁盘的方法
公开(公告)号：US20150340063A1
公开(公告)日：2015-11-26
申请号：US14716390
申请日：2015-05-19
申请人： GUZIK TECHNICAL ENTERPRISES
发明人： Vladislav Klimov
IPC分类号： G11B20/10 , G11B27/32 , G11B20/12
CPC分类号： G11B20/1217 , G11B5/455 , G11B5/59616 , G11B5/59666 , G11B19/048 , G11B20/10 , G11B20/10259 , G11B20/1252 , G11B27/10 , G11B27/24 , G11B27/322 , G11B2020/1287
摘要： Radially-coherent data reading from, and data writing to, a magnetic disk use non-coherently written synchronization signals on the disk. In a form, the radially-coherent data reading and writing is performed using a magnetic head/disk tester which includes a spinstand for supporting a spinning magnetic disk, a magnetic head assembly, a write channel network for generating a write data signal for application to a write element of the magnetic head, a read channel for receiving a read-back signal from a read element of the magnetic head assembly, and a signal processing system that analyzes a read-back signal from a disk and provides synchronization signals for radially-coherent data reading and data writing.
摘要翻译：与磁盘的数据读取和数据写入的相干相干数据在磁盘上使用非相干写入的同步信号。在一种形式中，使用磁头/磁盘测试仪进行径向相干数据读取和写入，该磁头/磁盘测试器包括用于支撑旋转磁盘的纺锤架，磁头组件，用于产生写数据信号的写通道网络，用于应用于磁头的写入元件，用于从磁头组件的读取元件接收回读信号的读取通道，以及信号处理系统，其从盘分析回读信号并提供用于径向放大的同步信号，相干数据读取和数据写入。

7. 发明授权

US09129629B1 Clock accuracy determining method and clock accuracy determining device 有权
标题翻译：时钟精度确定方法和时钟精度确定装置
公开(公告)号：US09129629B1
公开(公告)日：2015-09-08
申请号：US14280083
申请日：2014-05-16
申请人： Kabushiki Kaisha Toshiba
发明人： Yutaka Yoshida
IPC分类号： G11B5/09 , G11B5/596
CPC分类号： G11B5/59616 , G11B5/59666
摘要： According to one embodiment, when a timing error between a signal read back from a multi-spiral pattern pre-recorded on a magnetic disc and an SSW clock generated at a read/write channel is set as an SSW clock following error, SSW clock accuracy is determined based on results of comparison between SSW clock following errors read from two different points in each of spiral patterns constituting the multi-spiral pattern.
摘要翻译：根据一个实施例，当从预先记录在磁盘上的多螺旋图案读回的信号和在读/写通道产生的SSW时钟之间的定时误差被设置为跟随误差的SSW时钟时，SSW时钟精度基于从构成多螺旋图案的每个螺旋图案中的两个不同点读取的SSW时钟跟随误差之间的比较结果来确定。

8. 发明授权

US09093097B1 Ammonite servo reference pattern writing for heat-assisted magnetic recording 有权
标题翻译：用于热辅助磁记录的氨纶伺服参考图案写入
公开(公告)号：US09093097B1
公开(公告)日：2015-07-28
申请号：US14616231
申请日：2015-02-06
申请人： Seagate Technology LLC
发明人： ChungWoo Lee , SangHan Lee , JiHoon Lee
IPC分类号： G11B5/596 , G11B5/00
CPC分类号： G11B5/59661 , G11B5/59666 , G11B2005/0021
摘要： Technologies are described herein for writing servo reference patterns in a storage device implementing heat-assisted magnetic recording. A recording signal for the servo reference patterns is generated through a read/write channel to a read/write head of the storage device. The read/write head is moved across a recording surface of a disk in the storage device as the disk is rotated and an intermittent signal is applied to a write gate interposed between the read/write channel and the read/write head so that a maximum continuous writing time of the recording signal does not exceed a continuous write time limit of the storage device.
摘要翻译：本文描述了在实施热辅助磁记录的存储装置中写入伺服参考图案的技术。用于伺服参考图案的记录信号通过读/写通道产生到存储装置的读/写头。当盘旋转时，读/写头在存储装置中的盘的记录表面上移动，并且间歇信号被施加到插入在读/写通道和读/写头之间的写入门，使得最大记录信号的连续写入时间不超过存储装置的连续写入时间限制。

9. 发明授权

US09070396B1 Method and apparatus for initial self-servo writing based on writing timing tracks on a disk 有权
标题翻译：基于在盘上写入定时轨迹的初始自伺服写入的方法和装置
公开(公告)号：US09070396B1
公开(公告)日：2015-06-30
申请号：US14531121
申请日：2014-11-03
申请人： Marvell International Ltd.
发明人： Supaket Katchmart , David Liaw , Jerome F. Richgels , Henri Sutioso
IPC分类号： G11B5/02 , G11B5/596 , G11B20/10
CPC分类号： G11B5/59666 , G11B20/10222
摘要： Embodiments of the present disclosure provide a method of self-servo writing, the method comprising actions of positionally tracking a selected timing track of a data storage disk, wherein the selected timing track has one or more timing segments; synchronizing an angular position signal to rotation of the data storage disk based on at least one of the one or more timing segments of the selected timing track; specifying servo sector positions relative to the synchronized angular position signal; writing servo sectors to the data storage disk at the specified servo sector positions relative to the synchronized angular position signal; detecting one or more positional errors in timing segments of a next timing track of the data storage disk based at least in part on the synchronized angular position signal; and accounting for the detected one or more positional errors in writing subsequent servo tracks. Other embodiments are also described.
摘要翻译：本公开的实施例提供了一种自伺服写入的方法，该方法包括对数据存储盘的选定定时轨道进行位置跟踪的动作，其中所选择的定时轨道具有一个或多个定时段; 基于所选定时轨道的一个或多个定时段中的至少一个，将角位置信号与数据存储盘的旋转同步; 指定相对于同步角位置信号的伺服扇区位置; 在相对于同步角位置信号的指定伺服扇区位置将伺服扇区写入数据存储盘; 至少部分地基于所述同步角位置信号来检测所述数据存储盘的下一定时轨道的定时段中的一个或多个位置误差; 并且考虑在写入后续伺服磁道时检测到的一个或多个位置误差。还描述了其它实施例。

10. 发明授权

US08873183B2 Disk drive and method of writing servo write tracks to a disk 有权
标题翻译：将磁盘驱动器和将伺服写入磁道写入磁盘的方法
公开(公告)号：US08873183B2
公开(公告)日：2014-10-28
申请号：US12963580
申请日：2010-12-08
申请人： Kei Yasuna , Tomoo Ozaki , Makoto Takase , Takao Horiguchi
发明人： Kei Yasuna , Tomoo Ozaki , Makoto Takase , Takao Horiguchi
IPC分类号： G11B5/596
CPC分类号： G11B5/59633 , G11B5/59666 , G11B5/59672
摘要： A system and method of writing servo write tracks to a rotating disk using a head having a read/write offset is disclosed. One embodiment utilizes a write element on the head to write the servo write tracks. A read element on the head is then positioned over the servo write tracks. The phase of a specific frequency component of the track shape error in the servo write track is measured during the positioning of the read element over the servo write track. A sine wave having a specific frequency and a phase is selected based on the measurement results. The sine wave is then applied to a servo system as a correction signal. A new servo write track is then written with the write element.
摘要翻译：公开了一种使用具有读/写偏移量的磁头将伺服写轨迹写入旋转磁盘的系统和方法。一个实施例利用头上的写入元件来写入伺服写入轨迹。然后将磁头上的读取元件定位在伺服写入磁道上。伺服写入磁道中的磁道形状误差的特定频率分量的相位在读取元件在伺服写入磁道上的定位期间被测量。基于测量结果选择具有特定频率和相位的正弦波。然后将正弦波作为校正信号施加到伺服系统。然后用写入元件写入新的伺服写入轨迹。

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