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    RECORDING IN PROBE-BASED DATA STORAGE DEVICES
    33.
    发明申请
    RECORDING IN PROBE-BASED DATA STORAGE DEVICES 失效
    基于探测数据存储设备的记录

    公开(公告)号：US20080144477A1

    公开(公告)日：2008-06-19

    申请号：US11944487

    申请日：2007-11-23

    申请人： Evangelos S. Eleftheriou ,  Charalampos Pozidis

    发明人： Evangelos S. Eleftheriou ,  Charalampos Pozidis

    IPC分类号： G11B9/00

    CPC分类号： G11B9/14 ,  B82Y10/00 ,  G11B11/007

    摘要： Methods and apparatus are provided for recording/reproduction of data in a probe-based data storage device (1) in which application of a write signal causes formation of an indentation in a storage surface (5) by a probe of the device (1). Instead of storing information in the presence or absence of indentations on the storage surface as is conventionally done in such devices, information is stored in the form of grooves of variable length separated by lands of variable length. More particularly, a sequence of n>1 successive bits of a first value (typically “1's”) in a recording signal is recorded by applying a series of write signals at respective probe-positions on the storage surface (5). These probe-positions are spaced at w≦M, where M is the indentation merging distance, so that the resulting indentations merge to form a groove in the storage surface (5) spanning n readback sample positions. The readback signal corresponding to the recording signal is sampled at timings corresponding to the readback sample positions to recover the original bit sequence. High density recording is provided because the readback sample position spacing s here satisfies s

    摘要翻译： 提供了用于在基于探针的数据存储装置（1）中记录/再现数据的方法和装置，其中写入信号的应用通过装置（1）的探针在存储表面（5）中形成凹陷， 。 不像在这样的设备中常规地在存储表面上存在或不存在凹陷的信息而不是存储信息，而是以可变长度的分隔的可变长度的凹槽的形式存储信息。 更具体地，通过在存储表面（5）上的相应探针位置施加一系列写入信号来记录记录信号中的第一值（通常为“1”）的n> 1个连续位的序列。 这些探针位置间隔为w <= M，其中M是压痕合并距离，从而导致的凹陷合并，形成跨越n个回读采样位置的存储表面（5）中的凹槽。 对应于记录信号的回读信号在对应于回读采样位置的定时被采样，以恢复原始位序列。 提供高密度记录，因为这里的回读采样位置间隔s满足s

    Intra-disk coding scheme for data-storage systems
    36.
    发明授权
    Intra-disk coding scheme for data-storage systems 有权
    数据存储系统的磁盘内编码方案

    公开(公告)号：US07823011B2

    公开(公告)日：2010-10-26

    申请号：US11843323

    申请日：2007-08-22

    申请人： Ajay Dholakia ,  Ilias Iliadis ,  Robert Haas ,  Xiaoyu-Yu Hu ,  Evangelos S. Eleftheriou ,  Roman A. Pletka

    发明人： Ajay Dholakia ,  Ilias Iliadis ,  Robert Haas ,  Xiaoyu-Yu Hu ,  Evangelos S. Eleftheriou ,  Roman A. Pletka

    IPC分类号： G06F11/00

    CPC分类号： G06F11/1076 ,  G06F2211/1088

    摘要： Exemplary embodiments of the present invention comprise a method for the use of an intra-disk redundancy storage protection operation for the scrubbing of a disk. The method comprises initiating a disk scrubbing operation upon each disk of a plurality of disks that are comprised within a storage disk array, issuing a disk scrubbing command for a predetermined segment of the disks that are comprised within the storage disk array at a predetermined time interval, and identifying an unrecoverable segment on a disk. The method further comprises determining if unrecoverable sectors comprised within the unrecoverable segment can be reconstructed, and reconstructing the unrecoverable sectors of the unrecoverable segment and relocating the segment to a spare storage location on the disk in the event that the segment cannot be reconstructed within its original storage location.

    摘要翻译： 本发明的示例性实施例包括一种用于擦除盘的盘内冗余存储保护操作的方法。 该方法包括在包含在存储盘阵列内的多个盘的每个盘上启动磁盘擦除操作，以预定的时间间隔为包含在存储盘阵列内的盘的预定段发出磁盘擦除命令 并且识别磁盘上的不可恢复的段。 所述方法还包括确定是否可以重建包含在不可恢复的段内的不可恢复的扇区，以及在该段不能在其原始帧内重建的情况下，重构不可恢复段的不可恢复扇区并将该段重定位到盘上的备用存储位置 存储位置。

    Decoding low density parity check codes
    39.
    发明授权
    Decoding low density parity check codes 失效

    公开(公告)号：US07000167B2

    公开(公告)日：2006-02-14

    申请号：US10044624

    申请日：2002-01-08

    申请人： Jon Coker ,  Ajay Dholakia ,  Evangelos S. Eleftheriou ,  Rick Galbraith ,  Thomas Mittelholzer ,  Sedat Oelcer

    发明人： Jon Coker ,  Ajay Dholakia ,  Evangelos S. Eleftheriou ,  Rick Galbraith ,  Thomas Mittelholzer ,  Sedat Oelcer

    IPC分类号： H03M13/00

    CPC分类号： H03M13/112 ,  H03M13/1117 ,  H03M13/1515 ,  H03M13/255 ,  H03M13/2906 ,  H03M13/6331 ,  H03M13/6583

    摘要： A method for decoding Low Density Parity Check (LDPC) codes comprises executing a sum product algorithm to recover a set of information bits from an LDPC code represented as a bipartite graph of symbol nodes and check nodes, the sum product algorithm being responsive to input log likelihood ratios associated with the symbol nodes. The check nodes are updated by generating a set of forward difference metrics and a set of backward difference metrics in dependence on the ratios of logarithmic probabilities each associated with a corresponding symbol node of the LDPC code, updating each metric in the set of forward difference metrics in dependence on the absolute value of the log likelihood ratio associated with the symbol node and the absolute value of the previous metric in the set, updating each metric in the set of backward difference metrics in dependence on the absolute value of the log likelihood ratio associated with the symbol node and the absolute value of the previous metric in the set, and generating log likelihood ratios to be propagated back to each symbol node in dependence on the updated sets of forward and backward difference metrics.

    Data storage systems
    40.
    发明授权
    Data storage systems 失效
    数据存储系统

    公开(公告)号：US07574646B2

    公开(公告)日：2009-08-11

    申请号：US11286582

    申请日：2005-11-25

    申请人： Roy D. Cideciyan ,  Ajay Dholakia ,  Evangelos S. Eleftheriou ,  Thomas Mittelholzer

    发明人： Roy D. Cideciyan ,  Ajay Dholakia ,  Evangelos S. Eleftheriou ,  Thomas Mittelholzer

    IPC分类号： H03M13/00

    CPC分类号： G11B20/1833

    摘要： A method for decoding data in a data storage system includes generating an output bit stream; generating a first error corrected bit stream in dependence on the output bit stream; generating a second error corrected bit stream in dependence on the first error corrected bit stream; generating a checksum in dependence of the second error corrected bit stream; and, in the event that the checksum is indicative of errors in the second error corrected bit stream and the second error corrected bit stream comprises at least one correct interleave: supplying data indicative of locations of correct bits in the second error corrected bit stream; and, regenerating the first error corrected bit stream in dependence on the pinning data.

    摘要翻译： 一种用于在数据存储系统中解码数据的方法包括：生成输出比特流; 根据输出比特流产生第一纠错比特流; 根据第一纠错比特流产生第二纠错比特流; 根据第二纠错比特流产生校验和; 并且在所述校验和指示所述第二纠错比特流中的错误并且所述第二纠错比特流包括至少一个正确交错的情况下：提供指示所述第二纠错比特流中的正确比特的位置的数据; 以及根据钉扎数据再生第一纠错比特流。