公开(公告)号：US20150009589A1

公开(公告)日：2015-01-08

申请号：US14378778

申请日：2013-02-18

Applicant: Agency for Science, Technology and Research

Inventor： Chiew Leong Wong ,  Pantelis Alexopoulos ,  Zhimin Yuan ,  Chun Lian Ong

IPC: G11B5/596

CPC classification number: G11B5/012 ,  G11B5/59638 ,  G11B5/5965 ,  G11B5/59655 ,  G11B5/66 ,  G11B5/82

Abstract: In various embodiments, a method of writing servo information to a recording medium may be provided. The method include forming a first servo pattern (including a servo burst pattern) on a segment of a first track of a first layer of the recording medium, the first track having a track width. The method may further include forming a second servo pattern (including addressing information) on a segment of a second track of a second layer of the recording medium. The second track is arranged from the first track by half the track width.

Abstract translation: 在各种实施例中，可以提供将伺服信息写入记录介质的方法。 该方法包括在记录介质的第一层的第一轨道的段上形成第一伺服模式（包括伺服脉冲串图形），第一轨道具有磁道宽度。 该方法还可以包括在记录介质的第二层的第二轨道的段上形成第二伺服模式（包括寻址信息）。 第二轨道从第一轨道排列一半轨道宽度。

公开(公告)号：US20130148236A1

公开(公告)日：2013-06-13

申请号：US13684116

申请日：2012-11-21

Applicant: Agency for Science, Technology and Research

Inventor： Chun Lian Ong ,  Zhimin Yuan ,  Jingliang Zhang ,  Bo Liu

IPC: G11B21/03

CPC classification number: G11B20/10222 ,  G11B20/10259

Abstract: According to embodiments of the present invention, a method for providing a synchronization signal for at least one of a read operation or a write operation carried out by means of a head in a data storage device is provided. The method includes obtaining a readback servo signal from a storage medium of the data storage device by means of the head, the readback servo signal having at least one frequency associated with a servo track of the storage medium, frequency mixing the readback servo signal with a local signal having a local frequency to provide a frequency mixed signal, and filtering the frequency mixed signal to provide the synchronization signal for at least one of the read operation or the write operation. According to further embodiments of the present invention, a data storage device is also provided.

Abstract translation: 根据本发明的实施例，提供一种用于提供用于通过数据存储装置中的磁头执行的读取操作或写入操作中的至少一个的同步信号的方法。 该方法包括通过头部从数据存储装置的存储介质获得回读伺服信号，回读伺服信号具有与存储介质的伺服轨道相关联的至少一个频率，将回读伺服信号与 具有本地频率以提供频率混合信号的本地信号，以及对频率混合信号进行滤波以为读取操作或写入操作中的至少一个提供同步信号。 根据本发明的另外的实施例，还提供了数据存储装置。

公开(公告)号：US20140022877A1

公开(公告)日：2014-01-23

申请号：US13946621

申请日：2013-07-19

Applicant: Agency for Science, Technology and Research

Inventor： Chun Lian Ong ,  Zhimin Yuan ,  Shiming Ang

IPC: G11B20/24

CPC classification number: G11B20/24 ,  G11B20/10046 ,  G11B20/1217 ,  G11B2220/2516

Abstract: According to various embodiments, a method for reading data from a storage medium using a reader, wherein the reader includes at least one reader head, may be provided, wherein the storage medium includes a plurality of tracks. The method may include: reading a first signal with a reader head of the reader at a pre-determined position of the storage medium; reading a second signal with a reader head of the reader at the pre-determined position of the storage medium; and determining data stored at the pre-determined position of the storage medium based on the first signal and based on the second signal.

Abstract translation: 根据各种实施例，可以提供一种使用读取器从存储介质读取数据的方法，其中读取器包括至少一个读取头，其中存储介质包括多个轨道。 该方法可以包括：在读取器的读取头在存储介质的预定位置读取第一信号; 在所述存储介质的预定位置读取读取器的读取头的第二信号; 以及基于所述第一信号确定存储在所述存储介质的预定位置的数据，并且基于所述第二信号。

公开(公告)号：US09123386B2

公开(公告)日：2015-09-01

申请号：US13666118

申请日：2012-11-01

Applicant: Agency for Science, Technology and Research

Inventor： Zhimin Yuan ,  Bo Liu ,  Shengbin Hu ,  Chun Lian Ong

IPC: G11B5/60 ,  G11B27/36

CPC classification number: G11B27/36 ,  G11B5/6011 ,  G11B5/6029 ,  G11B5/607

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20130335843A1

公开(公告)日：2013-12-19

申请号：US13891735

申请日：2013-05-10

Applicant: Agency for Science, Technology And Research

Inventor： Budi Santoso ,  Yuan Zhimin ,  Siang Huei Leong ,  Chun Lian Ong ,  Pantelis Elexopoulos

IPC: G11B27/36

CPC classification number: G11B5/09 ,  G11B5/6029 ,  G11B19/048 ,  G11B27/36

Abstract: 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.

Abstract translation: 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生成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。