公开(公告)号：US08982491B1

公开(公告)日：2015-03-17

申请号：US14031970

申请日：2013-09-19

Applicant: HGST Netherlands B.V.

Inventor： Jonathan Darrel Coker ,  Richard Leo Galbraith ,  Weldon Mark Hanson ,  Travis Roger Oenning ,  Srinivasan Surendran

IPC: G11B5/09 ,  G11B20/12

CPC classification number: G11B20/1217 ,  G11B2020/1232

Abstract: A hard disk drive has disks with data sector preambles that allow for inter-track interference. The same data sector preamble is used for all data sectors in a track but the preamble in each track is different from the preamble in radially adjacent tracks. In a first embodiment each preamble includes a synchronization field (SF) and synchronization mark (SM) that are the same in each track but different from the SF and SM in radially adjacent tracks. Only two unique SFs and two unique SMs are required, with the two SFs and two SMs alternating in radially adjacent tracks. In a second embodiment the preambles are “integrated”, meaning that the preamble is a sequence of bits that does not include separate dedicated fields, like SF and SM. The preamble bit sequences are decoded using matched filters to provide bit synchronization and start-of-data information.

Abstract translation: 硬盘驱动器具有带数据扇区前导码的磁盘，允许进行轨道间干扰。 对于轨道中的所有数据扇区使用相同的数据扇区前同步码，但是每个轨道中的前导码与径向相邻轨道中的前同步码不同。 在第一实施例中，每个前导码包括在每个轨道中相同但与径向相邻轨道中的SF和SM不同的同步字段（SF）和同步标记（SM）。 只需要两个独特的SF和两个独特的SM，两个SF和两个SM在径向相邻的轨道中交替。 在第二实施例中，前导码是“集成的”，这意味着前同步码是不包括单独的专用字段（如SF和SM）的比特序列。 使用匹配滤波器解码前导码比特序列，以提供比特同步和数据开始信息。

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.

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

IPC: G11B20/18 ,  G11B20/10

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。

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。

公开(公告)号：US09275656B1

公开(公告)日：2016-03-01

申请号：US14804063

申请日：2015-07-20

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Samir Y. Garzon ,  Weldon Mark Hanson ,  Alexander Taratorin

IPC: G11B5/09 ,  G11B20/10

CPC classification number: G11B5/09 ,  G11B5/02 ,  G11B20/10009 ,  G11B20/10018

Abstract: Disk drives with a Channel System and Write Driver Preamp architecture that dynamically adjusts the write driver's signal wave-shape depending on the write data signal pattern are described. The wave-shape control signal is generated in the Channel and transmitted to the Write Driver Preamp. Embodiments of the invention provide discrete n-level overshoot amplitude control using amplitude-level modulated (AML) signal. One embodiment implements a look-ahead strategy overshoot amplitude control where the overshoot amplitude for each transition depends only on the subsequent (following) bits in the data stream and not on any previously recorded data.

Abstract translation: 描述了具有通道系统和写入驱动器的磁盘驱动器根据写入数据信号模式动态地调整写入驱动器的信号波形的前置放大器架构。 波形控制信号在通道中产生并发送到写驱动器前置放大器。 本发明的实施例提供使用幅度电平调制（AML）信号的离散n级过冲幅度控制。 一个实施例实现了先行策略超调幅度控制，其中每个转换的过冲幅度仅取决于数据流中的后续（后续）位，而不依赖于任何先前记录的数据。

公开(公告)号：US08988807B1

公开(公告)日：2015-03-24

申请号：US14031989

申请日：2013-09-19

Applicant: HGST Netherlands B.V.

Inventor： Jonathan Darrel Coker ,  Richard Leo Galbraith ,  Weldon Mark Hanson ,  Travis Roger Oenning ,  Srinivasan Surendran

IPC: G11B5/09 ,  G11B20/12

CPC classification number: G11B20/1217 ,  G11B2020/1232

Abstract: A hard disk drive has disks with data sector preambles that allow for inter-track interference. The same data sector preamble is used for all data sectors in a track but the preamble in each track is different from the preamble in radially adjacent tracks. In a first embodiment each preamble includes a synchronization field (SF) and synchronization mark (SM) that are the same in each track but different from the SF and SM in radially adjacent tracks. Only two unique SFs and two unique SMs are required, with the two SFs and two SMs alternating in radially adjacent tracks. In a second embodiment the preambles are “integrated”, meaning that the preamble is a sequence of bits that does not include separate dedicated fields, like SF and SM. The preamble bit sequences are decoded using matched filters to provide bit synchronization and start-of-data information.

Abstract translation: 硬盘驱动器具有带数据扇区前导码的磁盘，允许进行轨道间干扰。 对于轨道中的所有数据扇区使用相同的数据扇区前同步码，但是每个轨道中的前导码与径向相邻轨道中的前同步码不同。 在第一实施例中，每个前导码包括在每个轨道中相同但与径向相邻轨道中的SF和SM不同的同步场（SF）和同步标记（SM）。 只需要两个独特的SF和两个独特的SM，两个SF和两个SM在径向相邻的轨道中交替。 在第二实施例中，前导码是“集成的”，这意味着前同步码是不包括单独的专用字段（如SF和SM）的比特序列。 使用匹配滤波器解码前导码比特序列，以提供比特同步和数据开始信息。

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

IPC: G11B5/58 ,  G11B5/596

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。

公开(公告)号：US20150077875A1

公开(公告)日：2015-03-19

申请号：US14031970

申请日：2013-09-19

Applicant: HGST Netherlands B.V.

Inventor： Jonathan Darrel Coker ,  Richard Leo Galbraith ,  Weldon Mark Hanson ,  Travis Roger Oenning ,  Srinivasan Surendran

IPC: G11B20/12

CPC classification number: G11B20/1217 ,  G11B2020/1232

Abstract: A hard disk drive has disks with data sector preambles that allow for inter-track interference. The same data sector preamble is used for all data sectors in a track but the preamble in each track is different from the preamble in radially adjacent tracks. In a first embodiment each preamble includes a synchronization field (SF) and synchronization mark (SM) that are the same in each track but different from the SF and SM in radially adjacent tracks. Only two unique SFs and two unique SMs are required, with the two SFs and two SMs alternating in radially adjacent tracks. In a second embodiment the preambles are “integrated”, meaning that the preamble is a sequence of bits that does not include separate dedicated fields, like SF and SM. The preamble bit sequences are decoded using matched filters to provide bit synchronization and start-of-data information.

Abstract translation: 硬盘驱动器具有带数据扇区前导码的磁盘，允许进行轨道间干扰。 对于轨道中的所有数据扇区使用相同的数据扇区前同步码，但是每个轨道中的前导码与径向相邻轨道中的前同步码不同。 在第一实施例中，每个前导码包括在每个轨道中相同但与径向相邻轨道中的SF和SM不同的同步字段（SF）和同步标记（SM）。 只需要两个独特的SF和两个独特的SM，两个SF和两个SM在径向相邻的轨道中交替。 在第二实施例中，前导码是“集成的”，这意味着前同步码是不包括单独的专用字段（如SF和SM）的比特序列。 使用匹配滤波器解码前导码比特序列，以提供比特同步和数据开始信息。

公开(公告)号：US09111561B1

公开(公告)日：2015-08-18

申请号：US14526336

申请日：2014-10-28

Applicant: HGST Netherlands B.V.

Inventor： John Contreras ,  Samir Y. Garzon ,  Weldon Mark Hanson ,  Rehan Ahmed Zakai

IPC: G11B5/03 ,  G11B5/596

CPC classification number: G11B5/59616 ,  G11B5/02 ,  G11B20/10018

Abstract: A disk drive dynamic wave shaper (DWS) write driver includes a write current generator that produces a baseline output current for the write current pulses and an overshoot current generator that produces an overshoot current with different values. The overshoot current is added to the baseline current, with the value of the overshoot current amplitude (OSA) being selected in response to the frequency of transitions in the write data signal. The write driver includes logic circuitry that detects the pattern of transitions. Transitions that are immediately followed by a transition will receive a larger-than-nominal OSA1, transitions that are not immediately followed by a transition and that are not preceded by a long sequence of non-transitions will receive a nominal OSA2, and transitions after longer sequences of non-transitions will receive a smaller-than-nominal OSA3.

Abstract translation: 磁盘驱动器动态波形整形器（DWS）写入驱动器包括写入电流发生器，其产生写入电流脉冲的基线输出电流和产生具有不同值的过冲电流的过冲电流发生器。 过冲电流被加到基线电流上，响应于写入数据信号中的转换频率来选择过冲电流幅度（OSA）的值。 写驱动器包括检测转换模式的逻辑电路。 紧随其后的转换将接收到大于标称的OSA1，不是紧随其后的过渡的转换，而不是长时间的非转换序列将接收标称的OSA2，并且在更长时间后转换 非转换序列将接收到小于标称的OSA3。

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

IPC: H03M13/00 ,  H03M13/11 ,  G11B20/12 ,  G11B20/18 ,  H03M13/27 ,  H03M13/37 ,  H03M13/09

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。