公开(公告)号：US07209304B2

公开(公告)日：2007-04-24

申请号：US10172515

申请日：2002-06-14

申请人： Edmun Chian Song Seng ,  UttHeng Kan

发明人： Edmun Chian Song Seng ,  UttHeng Kan

IPC分类号： G11B5/02

CPC分类号： G11B5/012 ,  G11B5/00 ,  G11B5/02 ,  G11B5/09 ,  G11B27/36 ,  G11B2005/001 ,  G11B2220/20

摘要： The thermal decay of data written to a magnetic mass storage medium is determined by measuring and analyzing the time-domain equalized-signal-to-noise ratio (ESNR) and equalized signal-to-total-distortion noise ratio (ESTDR) of written data. In some embodiments, a test track and a reference track are initialized from data. Subsequently, the reference track is re-initialized from the test data, and the time-domain ESNR and/or ESTDR measurements are made of the test track and the reference track, at predetermined time intervals. Later, the time-domain ESNR and ESTDR measurements are analyzed to determine the thermal decay of the data written. In another embodiment of the present invention, the ESNR and/or ESTDR measurements includes reading the data through a non-return-to-zero bus in phases, in which the phases are selected in sequence.

摘要翻译： 通过测量和分析时域均衡信噪比（ESNR）和写入数据的均衡信号与总失真噪声比（ESTDR）来确定写入磁性大容量存储介质的数据的热衰减 。 在一些实施例中，从数据初始化测试轨道和参考轨道。 随后，从测试数据重新初始化参考轨迹，并且以预定的时间间隔对测试轨道和参考轨道进行时域ESNR和/或ESTDR测量。 之后，分析了时域ESNR和ESTDR测量结果，以确定所写数据的热衰减。 在本发明的另一个实施例中，ESNR和/或ESTDR测量包括分阶段地通过非归零总线读取数据，其中阶段被依次选择。

公开(公告)号：US06754030B2

公开(公告)日：2004-06-22

申请号：US10029318

申请日：2001-12-21

申请人： Edmun Chian Song Seng ,  Xiong Liu ,  Aik Chuan Lim ,  Kay Hee Tang ,  Utt Heng Kan ,  Choon Kiat Lim

发明人： Edmun Chian Song Seng ,  Xiong Liu ,  Aik Chuan Lim ,  Kay Hee Tang ,  Utt Heng Kan ,  Choon Kiat Lim

IPC分类号： G11B500

CPC分类号： G11B20/20 ,  G11B5/59627 ,  G11B27/36 ,  G11B2220/20

摘要： A method of and apparatus for generating a reader-to-writer offset for a head positioned over a track on a disc in a disc drive having a plurality of tracks is disclosed. A reader and a writer are mounted on the head in a non-overlapping manner with a gap between the reader and the writer, which is known as the reader-to-writer offset. A disc drive controller is operably connected to the reader and the writer. The disc drive controller determines the reader-to-writer offset of the head for each track by computing the difference between a first head position x1 and a second head position x2. The first head position x1 is an optimal head position for writing information on the track and the second head position x2 is a midpoint of an off-track capability (OTC) of the head. The OTC is a portion of a track pitch over which the reader is expected to read information that is free of an incorrigible bit error such that the writer-to-reader track misregistration (TMR) is minimized as the head is radially displaced the reader-to-writer offset to read information written on the track or to write information on the track.

摘要翻译： 公开了一种用于为位于具有多个磁道的磁盘驱动器中的磁盘上的轨道上的磁头产生读取器到写入器偏移的方法和装置。 阅读器和写入器以不重叠的方式安装在头上，读取器和写入器之间的间隙被称为读写器偏移。 磁盘驱动器控制器可操作地连接到读取器和写入器。 磁盘驱动器控制器通过计算第一磁头位置x1和第二磁头位置x2之间的差来确定每个轨道的磁头的读写器偏移。 第一头位置x1是用于在轨道上写入信息的最佳头部位置，而第二头部位置x2是头部的偏离轨迹能力（OTC）的中点。 OTC是轨道间距的一部分，阅读器期望阅读器读取没有不可避免的位错误的信息，使得写入器到读取器轨迹重合失调（TMR）最小化，因为磁头使读取器 - 写入器偏移以读取写在轨道上的信息或在轨道上写入信息。