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1.发明授权Magnetic recording disk drive with write position error signal values written in the data tracks for compensation of track misregistration 有权磁记录磁盘驱动器，写入位置误差信号值写入数据轨道，以补偿轨道重合失调公开(公告)号：US09437232B1
公开(公告)日：2016-09-06
申请号：US14800444
申请日：2015-07-15
Applicant: HGST Netherlands B.V.
Inventor： Richard Leo Galbraith , Weldon Mark Hanson , Roger William Wood
CPC classification number: G11B5/59627 , G11B5/012 , G11B5/59672 , G11B5/59688
Abstract: A hard disk drive is adapted to take the most recent estimated read head positions (the position error signal or PES values) that are obtained during writing and write those values into the data sectors as written PES (WPES) values. The WPES values are available on readback for use as a predictor of the positions in which subsequent data sectors were written and are also available for use in a data recovery procedure should a particular data sector fail to be recovered. In two-dimensional magnetic recording, the difference between the WPES value and the read PES value is a quantity required to rapidly select the best 2D equalizer. The PES values may be encoded prior to being written into the data sectors. The WPES values are appended to the data sectors after the preamble and sync fields, which occur after every servo sector.
Abstract translation: 硬盘驱动器适于拍摄写入期间获得的最新估计的读取头位置（位置误差信号或PES值），并将这些值作为书面PES（WPES）值写入数据扇区。 WPES值在回读时可用，用作后续数据扇区写入位置的预测器，如果特定数据扇区无法恢复，也可用于数据恢复过程。 在二维磁记录中，WPES值和读取的PES值之间的差是快速选择最佳2D均衡器所需的量。 可以在写入数据扇区之前对PES值进行编码。 在每个伺服扇区之后发生的前同步码和同步字段之后，WPES值附加到数据扇区。
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公开(公告)号：US09059737B2
公开(公告)日：2015-06-16
申请号：US13875165
申请日：2013-05-01
Applicant: HGST Netherlands B.V.
Inventor： Jonathan Darrel Coker , Richard Leo Galbraith , Weldon Mark Hanson , Travis Roger Oenning , Roger William Wood
CPC classification number: H03M13/1102 , G11B20/1217 , G11B20/1833 , H03M13/09 , H03M13/27 , H03M13/373 , H03M13/3761
Abstract: Disk drives are described in which blocks of data spanning multiple sectors are encoded into a plurality of codewords which are then divided into segments that are physically separated (distributed) on the disk surface over multiple sectors in a distributed codeword block so that the codewords have an improved worst case SNR in comparison to individual sectors. This results in more even SNR performance for each codeword, which improves the performance for portions of a track which have lower than the average SNR. Embodiments are described in which the distributed codeword blocks span across tracks.
Abstract translation: 描述了磁盘驱动器，其中跨越多个扇区的数据块被编码成多个码字，然后这些码字被划分成在分布式码字块中的多个扇区上在磁盘表面上物理地分离（分布）的段，使得码字具有 与个别行业相比，改善了最坏情况的信噪比。 这导致针对每个码字的更均匀的SNR性能，这提高了具有低于平均SNR的磁道部分的性能。 描述了其中分布式码字块跨越轨道的实施例。
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公开(公告)号：US09036304B1
公开(公告)日：2015-05-19
申请号：US14281461
申请日：2014-05-19
Applicant: HGST Netherlands B.V.
Inventor： Richard Leo Galbraith , Roger William Wood
CPC classification number: G11B5/4886 , G11B5/02 , G11B5/09 , G11B5/3958 , G11B20/10046
Abstract: A dual-stack read sensor is utilized in a storage device having an actuator arm that positions the read sensor over a rotating storage medium. The dual-stacked read sensor includes a primary read sensor having a first set of read sensor characteristics and a secondary read sensor having a second set of read sensor characteristics that differ from the first set of read sensor characteristics, wherein the secondary read sensor is positioned relative to the primary read sensor to be radially offset from the primary read sensor relative to a data track being read.
Abstract translation: 在具有将读取的传感器定位在旋转存储介质上的致动器臂的存储设备中使用双栈读取传感器。 双层读取传感器包括具有第一组读取传感器特性的主要读取传感器和具有与第一组读取传感器特性不同的第二组读取传感器特性的辅助读取传感器，其中辅助读取传感器被定位 相对于主读取传感器相对于正在读取的数据轨迹而与主读取传感器径向偏移。
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公开(公告)号：US09818440B1
公开(公告)日：2017-11-14
申请号：US15194412
申请日：2016-06-27
Applicant: HGST Netherlands B.V.
Inventor： Pierre-Olivier Jubert , Michael Konrad Grobis , Richard Leo Galbraith , Roger William Wood
CPC classification number: G11B5/64 , G11B2005/0021
Abstract: According to one embodiment, a heat assisted magnetic recording system includes a magnetic recording medium comprising a magnetic recording layer, where the magnetic recording layer includes a plurality of physical bits. Each physical bit has a perpendicular magnetic anisotropy and one of at least three magnetic states, where the at least three magnetic states include a +1 magnetic state, a 0 magnetic state, and a −1 magnetic state.
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公开(公告)号：US20170194024A1
公开(公告)日：2017-07-06
申请号：US14988651
申请日：2016-01-05
Applicant: HGST Netherlands B.V.
Inventor： Richard Leo Galbraith , Weldon Mark Hanson , Mark A. Nichols , Alexander Taratorin , Roger William Wood
IPC: G11B5/596
CPC classification number: G11B5/59683 , G11B5/59627
Abstract: A method, apparatus, and system are provided for implementing track following using signal asymmetry metrics monitored during read back in hard disk drives (HDDs). Signal asymmetry metrics monitored during read back are used together with a position error signal (PES) to correct and guide the position of a read sensor with respect to a written track in the HDD.
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Patent Agency Ranking
公开(公告)号：US09601144B1
公开(公告)日：2017-03-21
申请号：US15164636
申请日：2016-05-25
Applicant: HGST Netherlands B.V.
Inventor： Virat Vasav Mehta , James William Reiner , Michael Paul Salo , Roger William Wood
CPC classification number: G11B5/66 , G11B5/65 , G11B5/653 , G11B2005/0021
Abstract: A heat-assisted magnetic recording (HAMR) disk drive has a disk with at least two independent data layers (RL1 and RL2), each data layer storing an independent data stream. At a high laser power both RL1 and RL2 are heated to above their respective Curie temperatures and a first data stream is recorded in both RL1 and RL2. At a lower laser power only upper RL2 is heated to above its Curie temperature and a second data stream is recorded only in RL2. The data layers are separated by a nonmagnetic spacer layer (SL) that prevents lower RL1 from being heated to above its Curie temperature at low laser power. The first and second data streams are typically asynchronous. Recorded data is read back from both data streams simultaneously as a composite readback signal. A joint Viterbi detector detects the asynchronous data streams simultaneously from the composite readback signal.
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7.发明授权System and method for testing data storage systems utilizing micro-transitions 有权使用微转换测试数据存储系统的系统和方法公开(公告)号：US09218847B2
公开(公告)日：2015-12-22
申请号：US14132966
申请日：2013-12-18
Applicant: HGST Netherlands B.V.
Inventor： Weldon Mark Hanson , Michael Paul Salo , Alexander Taratorin , Roger William Wood
CPC classification number: G11B20/182 , G11B20/10398
Abstract: A method of testing a one or more components of a data storage system introduces a first plurality of micro-transitions into a first data write pattern, which is then written to a magnetic media. A read-back signal is generated, and a frequency response of the read-back signal is analyzed to determine performance of the one or more components of the data storage system.
Abstract translation: 测试数据存储系统的一个或多个组件的方法将第一多个微转换引入第一数据写入模式，然后将其写入磁性介质。 生成回读信号，分析回读信号的频率响应，以确定数据存储系统的一个或多个组件的性能。
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8.发明授权Scalable repair block error correction for sequential multiple data blocks in a magnetic data storage device 有权磁数据存储设备中的顺序多个数据块的可扩展修复块错误校正公开(公告)号：US08856618B2
公开(公告)日：2014-10-07
申请号：US13645309
申请日：2012-10-04
Applicant: HGST Netherlands B.V.
Inventor： Kei Akiyama , Sridhar Chatradhi , Jonathan Darrel Coker , Martin Aureliano Hassner , Kirk Hwang , Roger William Wood
IPC: G11C29/00
CPC classification number: G11B5/09 , G11B20/1833
Abstract: A technique for recovering of “squeezed” sectors in a set of sequential sectors such as are used in Shingled Magnetic Recording (SMR) is described. Embodiments of the invention use a programmable erased sector recovery scheme, which is a concatenation of a “Cauchy-type” track erasure correction code, together with a media-error correction code that generates N-weighted parity-sectors per track and is capable of replacing up to N-erased sectors per track in any possible combination.
Abstract translation: 描述用于恢复诸如用于混合磁记录（SMR）的一组连续扇区中的“挤压”扇区的技术。 本发明的实施例使用可编程擦除扇区恢复方案，其是“柯西式”轨道擦除校正码的级联，以及每个轨道生成N个加权奇偶校验扇区的媒体纠错码，并且能够 以任何可能的组合替代每个轨道的N个擦除扇区。
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公开(公告)号：US20140201590A1
公开(公告)日：2014-07-17
申请号：US13875165
申请日：2013-05-01
Applicant: HGST NETHERLANDS B.V.
Inventor： Jonathan Darrel Coker , Richard Leo Galbraith , Weldon Mark Hanson , Travis Roger Oenning , Roger William Wood
IPC: G06F11/10
CPC classification number: H03M13/1102 , G11B20/1217 , G11B20/1833 , H03M13/09 , H03M13/27 , H03M13/373 , H03M13/3761
Abstract: Disk drives are described in which blocks of data spanning multiple sectors are encoded into a plurality of codewords which are then divided into segments that are physically separated (distributed) on the disk surface over multiple sectors in a distributed codeword block so that the codewords have an improved worst case SNR in comparison to individual sectors. This results in more even SNR performance for each codeword, which improves the performance for portions of a track which have lower than the average SNR. Embodiments are described in which the distributed codeword blocks span across tracks.
Abstract translation: 描述了磁盘驱动器，其中跨越多个扇区的数据块被编码成多个码字，然后这些码字被划分成在分布式码字块中的多个扇区上在磁盘表面上物理地分离（分布）的段，使得码字具有 与个别行业相比，改善了最坏情况的信噪比。 这导致针对每个码字的更均匀的SNR性能，这提高了具有低于平均SNR的磁道部分的性能。 描述了其中分布式码字块跨越轨道的实施例。
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10.发明申请SCALABLE REPAIR BLOCK ERROR CORRECTION FOR SEQUENTIAL MULTIPLE DATA BLOCKS IN A MAGNETIC DATA STORAGE DEVICE 有权磁性数据存储设备中的顺序多个数据块的可扩展修复块错误校正公开(公告)号：US20140101515A1
公开(公告)日：2014-04-10
申请号：US13645309
申请日：2012-10-04
Applicant: HGST NETHERLANDS B.V.
Inventor： Kei Akiyama , Sridhar Chatradhi , Jonathan Darrel Coker , Martin Aureliano Hassner , Kirk Hwang , Roger William Wood
IPC: H03M13/05
CPC classification number: G11B5/09 , G11B20/1833
Abstract: A technique for recovering of “squeezed” sectors in a set of sequential sectors such as are used in Shingled Magnetic Recording (SMR) is described. Embodiments of the invention use a programmable erased sector recovery scheme, which is a concatenation of a “Cauchy-type” track erasure correction code, together with a media-error correction code that generates N-weighted parity-sectors per track and is capable of replacing up to N-erased sectors per track in any possible combination.
Abstract translation: 描述用于恢复诸如用于混合磁记录（SMR）的一组连续扇区中的“挤压”扇区的技术。 本发明的实施例使用可编程擦除扇区恢复方案，其是“柯西式”轨道擦除校正码的级联，以及每个轨道生成N个加权奇偶校验扇区的媒体纠错码，并且能够 以任何可能的组合替代每个轨道的N个擦除扇区。
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