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    Magnetic disk apparatus and magnetic disk access controlling method
    1.
    发明授权
    Magnetic disk apparatus and magnetic disk access controlling method 有权
    磁盘装置和磁盘访问控制方法

    公开(公告)号：US07859779B2

    公开(公告)日：2010-12-28

    申请号：US12479397

    申请日：2009-06-05

    申请人： Mineo Moribe ,  Masakazu Taguchi ,  Kazuyuki Ozaki

    发明人： Mineo Moribe ,  Masakazu Taguchi ,  Kazuyuki Ozaki

    IPC分类号： G11B5/09 ,  G11B5/596

    CPC分类号： G11B5/59688 ,  B82Y10/00 ,  G11B5/59633 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B5/855

    摘要： A magnetic disk apparatus includes a magnetic disk, a magnetic head, a servo reproduction signal generator and a magnetic head controller. The disk includes a data recording area and a servo-pattern area. The data recording area includes a non-magnetic area scattered with magnetic regions, and the servo-pattern area includes uniformly magnetized magnetic regions larger than the magnetic regions in the recording area. The magnetic head reciprocates radially of the disk, giving a magnetization direction to the magnetic regions in the data recording area and reading the magnetization direction of the magnetic regions in the data recording area and the servo-pattern area. The servo reproduction signal generator reads the servo-pattern area, using the magnetic head, via an absolute-value calculation circuit to generate a servo reproduction signal before the recording or reading with respect to the data recording area. The magnetic head controller performs recording or reproducing with respect to the data recording area by controlling the magnetic head based on the servo reproduction signal.

    摘要翻译： 磁盘装置包括磁盘，磁头，伺服再现信号发生器和磁头控制器。 盘包括数据记录区和伺服图案区。 数据记录区域包括与磁性区域分散的非磁性区域，伺服图案区域包括比记录区域中的磁性区域大的均匀磁化的磁性区域。 磁头沿圆盘的径向往复运动，给数据记录区域的磁性区域提供磁化方向，并读取数据记录区域和伺服图形区域中磁区的磁化方向。 伺服再现信号发生器通过绝对值计算电路使用磁头读取伺服图形区域，以在相对于数据记录区域进行记录或读取之前产生伺服再现信号。 磁头控制器通过基于伺服再现信号控制磁头来执行关于数据记录区域的记录或再现。

    MAGNETIC DISK APPARATUS AND MAGNETIC DISK ACCESS CONTROLLING METHOD
    2.
    发明申请
    MAGNETIC DISK APPARATUS AND MAGNETIC DISK ACCESS CONTROLLING METHOD 有权
    磁盘设备和磁盘访问控制方法

    公开(公告)号：US20100020436A1

    公开(公告)日：2010-01-28

    申请号：US12479397

    申请日：2009-06-05

    申请人： Mineo Moribe ,  Masakazu Taguchi ,  Kazuyuki Ozaki

    发明人： Mineo Moribe ,  Masakazu Taguchi ,  Kazuyuki Ozaki

    IPC分类号： G11B5/596

    CPC分类号： G11B5/59688 ,  B82Y10/00 ,  G11B5/59633 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B5/855

    摘要： A magnetic disk apparatus includes a magnetic disk, a magnetic head, a servo reproduction signal generator and a magnetic head controller. The disk includes a data recording area and a servo-pattern area. The data recording area includes a non-magnetic area scattered with magnetic regions, and the servo-pattern area includes uniformly magnetized magnetic regions larger than the magnetic regions in the recording area. The magnetic head reciprocates radially of the disk, giving a magnetization direction to the magnetic regions in the data recording area and reading the magnetization direction of the magnetic regions in the data recording area and the servo-pattern area. The servo reproduction signal generator reads the servo-pattern area, using the magnetic head, via an absolute-value calculation circuit to generate a servo reproduction signal before the recording or reading with respect to the data recording area. The magnetic head controller performs recording or reproducing with respect to the data recording area by controlling the magnetic head based on the servo reproduction signal.

    摘要翻译： 磁盘装置包括磁盘，磁头，伺服再现信号发生器和磁头控制器。 盘包括数据记录区和伺服图案区。 数据记录区域包括与磁性区域分散的非磁性区域，伺服图案区域包括比记录区域中的磁性区域大的均匀磁化的磁性区域。 磁头沿圆盘的径向往复运动，给数据记录区域的磁性区域提供磁化方向，并读取数据记录区域和伺服图形区域中磁区的磁化方向。 伺服再现信号发生器通过绝对值计算电路使用磁头读取伺服图形区域，以在相对于数据记录区域进行记录或读取之前产生伺服再现信号。 磁头控制器通过基于伺服再现信号控制磁头来执行关于数据记录区域的记录或再现。

    Magnetic disk apparatus and magnetic disk access control method
    3.
    发明授权
    Magnetic disk apparatus and magnetic disk access control method 有权
    磁盘装置和磁盘访问控制方法

    公开(公告)号：US07848049B2

    公开(公告)日：2010-12-07

    申请号：US12484866

    申请日：2009-06-15

    申请人： Mineo Moribe ,  Masakazu Taguchi ,  Atsushi Tanaka

    发明人： Mineo Moribe ,  Masakazu Taguchi ,  Atsushi Tanaka

    IPC分类号： G11B21/02 ,  G11B5/596

    CPC分类号： G11B5/59633 ,  G11B5/59672

    摘要： A magnetic disk apparatus includes a magnetic disk, a magnetic head, a reverse-pulse detector, and a re-magnetizer. The magnetic disk includes a data recording area and a servo-pattern area. The magnetic regions of the servo-pattern area have been pre-magnetized in the same direction or pre-magnetizing direction. The magnetic head is arranged to reciprocate radially of the magnetic disk. The reverse-pulse detector is provided for reading the servo-pattern area with the magnetic head before data recording or reproducing with respect to the data recording area is performed. The reverse-pulse detector detects, from servo reproduction signal pulses, reverse pulses corresponding to the reversal of magnetization direction relative to the pre-magnetizing direction. The re-magnetizer causes the magnetic head to perform the re-magnetizing of the magnetic regions in the servo-pattern area when the count of reverse pulses is not smaller than a threshold number.

    摘要翻译： 磁盘装置包括磁盘，磁头，反向脉冲检测器和再磁化器。 磁盘包括数据记录区域和伺服图案区域。 伺服图案区域的磁区已经沿相同方向或预磁化方向预磁化。 磁头布置成在磁盘的径向往复运动。 反相脉冲检测器被提供用于在执行关于数据记录区域的数据记录或再现之前用磁头读取伺服图案区域。 反向脉冲检测器从伺服再现信号脉冲检测相对于预磁化方向反转磁化方向的反向脉冲。 当反向脉冲的计数不小于阈值时，再磁化器使磁头执行伺服图形区域中的磁区的再磁化。

    MAGNETIC DISK APPARATUS AND MAGNETIC DISK ACCESS CONTROL METHOD
    4.
    发明申请
    MAGNETIC DISK APPARATUS AND MAGNETIC DISK ACCESS CONTROL METHOD 审中-公开
    磁盘设备和磁盘访问控制方法

    公开(公告)号：US20100020432A1

    公开(公告)日：2010-01-28

    申请号：US12480375

    申请日：2009-06-08

    申请人： Mineo Moribe ,  Masakazu Taguchi ,  Atsushi Tanaka

    发明人： Mineo Moribe ,  Masakazu Taguchi ,  Atsushi Tanaka

    IPC分类号： G11B15/18

    CPC分类号： G11B5/59688

    摘要： A magnetic disk apparatus includes a magnetic disk provided with a data recording area and a servo-pattern area. The data recording area includes a non-magnetic area scattered with magnetic regions, and the servo-pattern area includes a plurality of magnetic regions each having a larger area than the magnetic regions in the data recording area. The magnetic disk apparatus also includes a reader for reading magnetization in the data recording area and the servo-pattern area, and a magnetizer for application of a magnetic field to the magnetic regions in the servo-pattern area for equalizing magnetization directions of the magnetic regions in the servo-pattern area before the reader starts to read the servo-pattern area.

    摘要翻译： 磁盘装置包括具有数据记录区域和伺服图案区域的磁盘。 数据记录区域包括用磁区散射的非磁性区域，并且伺服图案区域包括多个磁区，每个磁区具有比数据记录区中的磁区更大的面积。 磁盘装置还包括用于读取数据记录区域和伺服图形区域中的磁化的读取器，以及用于对伺服图形区域中的磁区域施加磁场的磁化器，用于均衡磁性区域的磁化方向 在读取器开始读取伺服图案区域之前的伺服图案区域中。

    MAGNETIC DISK APPARATUS AND MAGNETIC DISK ACCESS CONTROL METHOD
    7.
    发明申请
    MAGNETIC DISK APPARATUS AND MAGNETIC DISK ACCESS CONTROL METHOD 有权
    磁盘设备和磁盘访问控制方法

    公开(公告)号：US20100020433A1

    公开(公告)日：2010-01-28

    申请号：US12484866

    申请日：2009-06-15

    申请人： Mineo Moribe ,  Masakazu Taguchi ,  Atsushi Tanaka

    发明人： Mineo Moribe ,  Masakazu Taguchi ,  Atsushi Tanaka

    IPC分类号： G11B21/02

    CPC分类号： G11B5/59633 ,  G11B5/59672

    摘要： A magnetic disk apparatus includes a magnetic disk, a magnetic head, a reverse-pulse detector, and a re-magnetizer. The magnetic disk includes a data recording area and a servo-pattern area. The magnetic regions of the servo-pattern area have been pre-magnetized in the same direction or pre-magnetizing direction. The magnetic head is arranged to reciprocate radially of the magnetic disk. The reverse-pulse detector is provided for reading the servo-pattern area with the magnetic head before data recording or reproducing with respect to the data recording area is performed. The reverse-pulse detector detects, from servo reproduction signal pulses, reverse pulses corresponding to the reversal of magnetization direction relative to the pre-magnetizing direction. The re-magnetizer causes the magnetic head to perform the re-magnetizing of the magnetic regions in the servo-pattern area when the count of reverse pulses is not smaller than a threshold number.

    摘要翻译： 磁盘装置包括磁盘，磁头，反向脉冲检测器和再磁化器。 磁盘包括数据记录区域和伺服图案区域。 伺服图案区域的磁区已经沿相同方向或预磁化方向预磁化。 磁头布置成在磁盘的径向往复运动。 反相脉冲检测器被提供用于在执行关于数据记录区域的数据记录或再现之前用磁头读取伺服图案区域。 反向脉冲检测器从伺服再现信号脉冲检测相对于预磁化方向反转磁化方向的反向脉冲。 当反向脉冲的计数不小于阈值时，再磁化器使磁头执行伺服图形区域中的磁区的再磁化。

    Data recording/reproducing apparatus and data recording/reproducing method
    9.
    发明授权
    Data recording/reproducing apparatus and data recording/reproducing method 失效
    数据记录/再现装置和数据记录/再现方法

    公开(公告)号：US07430702B2

    公开(公告)日：2008-09-30

    申请号：US11041248

    申请日：2005-01-25

    申请人： Masakazu Taguchi

    发明人： Masakazu Taguchi

    IPC分类号： H03M13/00 ,  H03M13/03

    CPC分类号： G11B20/1813

    摘要： A data recording/reproducing method and apparatus for correcting data errors on a recording medium even with the use of a conventional ECC. The data recording/reproducing apparatus includes a generation unit that generates predetermined data units by dividing an ECC sector including error correction codes generated by an error correction encoder into prescribed data units and encoding the prescribed units into iterative encoded data units using an iterative encoder so that the predetermined data units may include the iterative-encoded data units, a recording unit, a reproducing unit, an iterative decoder for conducting iterative decoding on the predetermined data units, and an error correction decoder. The apparatus further includes a distribution unit for distributing the predetermined data units generated by the generation unit. The distribution unit distributes the iterative encoded data units using at least two ECC sectors and records the distributed data units on a recording medium.

    摘要翻译： 一种数据记录/再现方法和装置，用于即使使用传统的ECC也可以在记录介质上校正数据错误。 数据记录/重放装置包括一个生成单元，该生成单元通过将包括由纠错编码器产生的纠错码的ECC扇区除以规定的数据单位并使用迭代编码器将规定单元编码为迭代编码数据单元，从而生成预定数据单元， 预定数据单元可以包括迭代编码数据单元，记录单元，再现单元，用于对预定数据单元执行迭代解码的迭代解码器，以及纠错解码器。 该装置还包括分配单元，用于分配由生成单元生成的预定数据单元。 分发单元使用至少两个ECC扇区分布迭代编码的数据单元，并将分布式数据单元记录在记录介质上。

    Data readout device and data readout method
    10.
    发明授权
    Data readout device and data readout method 失效
    数据读出装置和数据读出方式

    公开(公告)号：US07287211B2

    公开(公告)日：2007-10-23

    申请号：US10339548

    申请日：2003-01-09

    申请人： Masakazu Taguchi ,  Akihiro Itakura

    发明人： Masakazu Taguchi ,  Akihiro Itakura

    IPC分类号： H03M13/03 ,  H03M13/00

    CPC分类号： H03M13/6343 ,  H03M13/15 ,  H03M13/2909 ,  H03M13/2957 ,  H03M13/41 ,  H03M13/6577

    摘要： A data readout device generates decoded data based on a data bit determined by performing a hard-decision on likelihood data. The likelihood data is generated using an iterative decoding method corresponding to a turbo-coding process. The decoding process is performed on a sampled value obtained by sampling a signal read out from a magneto-optical disk at a predetermined sampling period. A reliability determination part detects whether each obtained data bit was obtained from likelihood data within a predetermined range defined with respect to a histogram of log likelihood ratios. When it is detected that a data bit was obtained by a hard-decision on likelihood data within the predetermined range, the data bit is regarded as being obtained by a hard-decision whose reliability is not sufficient. In this way, the error correcting decoder can perform ECC-based decoding operations including loss-correction processes depending on respective reliability-determination results that distinguish reliabilities among respective data bits.

    摘要翻译： 数据读出装置基于通过对似然数进行硬判定而确定的数据位来生成解码数据。 使用对应于turbo编码处理的迭代解码方法生成似然数据。 对通过在预定采样周期对从磁光盘读出的信号进行采样而获得的采样值执行解码处理。 可靠性确定部分检测在相对于对数似然比的直方图定义的预定范围内的似然数据中是否获得了所获得的数据位。 当检测到通过在预定范围内的似然数据的硬判决获得数据位时，数据位被认为是通过可靠性不足的硬判决获得的。 以这种方式，错误校正解码器可以根据区分各个数据位之间的可靠性的各个可靠性确定结果，执行包括损失校正处理的基于ECC的解码操作。