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1. 发明申请

US20100050046A1 IDENTIFICATION OF POTENTIALLY ERRONEOUS AND/OR ERASED DATA 有权
标题翻译：识别潜在的错误和/或擦除的数据
公开(公告)号：US20100050046A1
公开(公告)日：2010-02-25
申请号：US12613058
申请日：2009-11-05
申请人： Michael H. Chen , Rajita Shrestha , James C. Alexander
发明人： Michael H. Chen , Rajita Shrestha , James C. Alexander
IPC分类号： G06F11/07 , H03M13/05 , G06F11/10
CPC分类号： G11B20/1833 , G11B2020/183 , G11B2020/1836
摘要： Systems for identifying potentially erroneous and/or erased data are provided. Systems have a bit detector, an accumulator, and a data reconstruction processor. The bit detector assigns values to bits read in a data signal. The bit detector illustratively assigns multiple values to each of the bits. The accumulator accumulates a count of the multiple values assigned by the bit detector for each of the bits. The accumulator associates each bit with a particular value based at least in part on its accumulated count. The data reconstruction processor determines for each of the bits a confidence level of the particular value associated to it. The data reconstruction process sets flags for a portion of the bits. The flags identify the portion of the bits as possible erased or erroneous data. The flags are set based at least in part on the confidence levels of the portion of the bits.
摘要翻译：提供用于识别潜在错误和/或擦除数据的系统。系统具有位检测器，累加器和数据重构处理器。位检测器为数据信号中读取的位分配值。位检测器说明性地将多个值分配给每个位。累加器累加由比特检测器为每个比特分配的多个值的计数。该累加器至少部分地基于其累加的计数将每个位与特定值相关联。数据重建处理器为每个位确定与其相关联的特定值的置信水平。数据重建过程为一部分位设置标志。这些标志标识可能被擦除或错误数据的位的部分。至少部分地基于位的部分的置信水平来设置标志。

2. 发明授权

US07352525B1 Hard disk drive fly height adjust method and apparatus during error recovery 有权
标题翻译：错误恢复期间的硬盘驱动器飞行高度调整方法和装置
公开(公告)号：US07352525B1
公开(公告)日：2008-04-01
申请号：US11449579
申请日：2006-06-07
申请人： Rajita Shrestha , Christine Green , Jerry Moline
发明人： Rajita Shrestha , Christine Green , Jerry Moline
IPC分类号： G11B21/02
CPC分类号： G11B19/041 , G11B5/6029 , G11B5/607
摘要： Data recovery, following a read error in a hard disk drive, is provided which includes an adjustment of fly height. In one embodiment, some re-reads are performed by both adjusting the fly height and the off-track positioning of the read head. In one embodiment, two or more fly heights are normally used during read/write operations such as in a zoned manner, and adjustments to fly heights are performed with respect to the fly height for the zone where the error occurred.
摘要翻译：提供硬盘驱动器读取错误后的数据恢复，其中包括飞行高度的调整。在一个实施例中，通过调整读取头的飞行高度和偏离轨迹的位置来执行一些重新读取。在一个实施例中，通常在诸如分区方式的读/写操作期间使用两个或更多个飞行高度，并且相对于发生错误的区域的飞行高度执行对飞行高度的调整。

3. 发明授权

US06995943B1 Off-track error recovery method and apparatus for disk drive 失效
标题翻译：磁盘驱动器的非磁道错误恢复方法和装置
公开(公告)号：US06995943B1
公开(公告)日：2006-02-07
申请号：US10317849
申请日：2002-12-11
申请人： Rajita Shrestha , Chris Aumann , Lace J. Herman , Glen Rewerts , Dave Rewerts
发明人： Rajita Shrestha , Chris Aumann , Lace J. Herman , Glen Rewerts , Dave Rewerts
IPC分类号： G11B5/596
CPC分类号： G11B5/59688 , G11B5/5582
摘要： An off-track error recovery method and apparatus for a disk drive are disclosed herein. Off-track errors are either due to vibration of the disk drive or due to defective servo data stored on a disk surface of the disk drive. In order to tailor error recovery operations associated with each of the two types of off-track errors, the present invention distinguishes between the two types of errors, when possible. Accordingly, the overall time for performing off-track error recovery operations is reduced and/or off-track error recovery operations are made more efficient.
摘要翻译：本文公开了一种用于磁盘驱动器的偏离磁道错误恢复方法和装置。离线错误是由于磁盘驱动器的振动或由于存储在磁盘驱动器的磁盘表面上的伺服数据不良所致。为了定制与两种类型的偏离轨道错误中的每一种相关联的错误恢复操作，本发明在可能的情况下区分两种类型的错误。因此，进行离轨错误恢复操作的总体时间被减少和/或越野错误恢复操作变得更有效。

4. 发明授权

US08196001B2 Identification of potentially erroneous and/or erased data 有权
标题翻译：识别潜在的错误和/或擦除的数据
公开(公告)号：US08196001B2
公开(公告)日：2012-06-05
申请号：US12613058
申请日：2009-11-05
申请人： Michael H. Chen , Rajita Shrestha , James C. Alexander
发明人： Michael H. Chen , Rajita Shrestha , James C. Alexander
IPC分类号： H03M13/00
CPC分类号： G11B20/1833 , G11B2020/183 , G11B2020/1836
摘要： Systems for identifying potentially erroneous and/or erased data are provided. Systems have a bit detector, an accumulator, and a data reconstruction processor. The bit detector assigns values to bits read in a data signal. The bit detector illustratively assigns multiple values to each of the bits. The accumulator accumulates a count of the multiple values assigned by the bit detector for each of the bits. The accumulator associates each bit with a particular value based at least in part on its accumulated count. The data reconstruction processor determines for each of the bits a confidence level of the particular value associated to it. The data reconstruction process sets flags for a portion of the bits. The flags identify the portion of the bits as possible erased or erroneous data. The flags are set based at least in part on the confidence levels of the portion of the bits.
摘要翻译：提供用于识别潜在错误和/或擦除数据的系统。系统具有位检测器，累加器和数据重建处理器。位检测器为数据信号中读取的位分配值。位检测器说明性地将多个值分配给每个位。累加器累加由比特检测器为每个比特分配的多个值的计数。该累加器至少部分地基于其累加的计数将每个位与特定值相关联。数据重建处理器为每个位确定与其相关联的特定值的置信水平。数据重建过程为一部分位设置标志。这些标志标识可能被擦除或错误数据的位的部分。至少部分地基于位的部分的置信水平来设置标志。

5. 发明授权

US07634706B1 Majority-detected erasure enhanced error correction 有权
标题翻译：多数检测到擦除增强纠错
公开(公告)号：US07634706B1
公开(公告)日：2009-12-15
申请号：US11481078
申请日：2006-07-05
申请人： Michael H. Chen , Rajita Shrestha , James C. Alexander
发明人： Michael H. Chen , Rajita Shrestha , James C. Alexander
IPC分类号： H03M13/43
CPC分类号： G11B20/1833 , G11B2020/183 , G11B2020/1836
摘要： A system for enhancing the error correction capability of an error correction code (“ECC”) during error recovery operations accumulates, for respective bits, counts of the number of times the bits are detected as 1s in multiple re-reads of a data signal. The system then determines, based on the associated count, if a reconstructed bit should be considered a 1 or 0, or neither, that is, if the reconstructed bit should be considered erroneous, by comparing the count to a majority detection threshold and then to either an upper or a lower predetermined threshold that corresponds to the confidence with which the bit is reconstructed as a either a 1 or a 0. If the confidence is sufficiently low, that is, if the count falls below the upper threshold or above the lower threshold, the reconstructed bit is flagged as erroneous. After all of the bits are reconstructed, the system groups the bits into symbols to reproduce the ECC codeword, and sets erasure pointers that identify the locations of a predetermined number, s, of the symbols that are associated with the highest degree of uncertainty, that is, the largest numbers of flagged bits or, as appropriate, the largest numbers of flagged bits with the lowest confidence levels. The error correction operation then decodes the symbols in the identified locations as erasures. The system, using an (n, k) distance d Reed-Solomon ECC uses 2t=n−k redundancy symbols to correct the s erasures and up to 2 ⁢ t - s 2 errors.
摘要翻译：用于在错误恢复操作期间增强纠错码（“ECC”）的纠错能力的系统针对各个比特，在数据信号的多次重新读取中，将比特的次数累计为1次。然后，系统基于关联的计数确定重构的比特应当被认为是1或0，或者两者都不是，即如果重构的比特被认为是错误的，则通过将计数与多数检测阈值进行比较，然后比较对应于将位重建为1或0的置信度的上限或下限预定阈值。如果置信度足够低，即如果计数低于上阈值或高于下阈值阈值，重建的位被标记为错误。在所有比特重构之后，系统将比特分组为符号以再现ECC码字，并且设置识别与最高不确定度相关联的符号的预定数目s的位置的擦除指针，是最大数量的标记位，或者酌情是具有最低置信水平的最大标记位数。然后，纠错操作将识别的位置中的符号解码为擦除。使用（n，k）距离d Reed-Solomon ECC的系统使用2t = n-k冗余符号来校正擦除和高达2t-s 2误差。

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