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1. 发明授权

US07298573B2 Magnetic disk drive with offset detection of composite magnetic head 有权
标题翻译：磁盘驱动器，具有复合磁头的偏移检测
公开(公告)号：US07298573B2
公开(公告)日：2007-11-20
申请号：US11304203
申请日：2005-12-14
申请人： Nobuhito Kitamura , Noriyuki Sumiya
发明人： Nobuhito Kitamura , Noriyuki Sumiya
IPC分类号： G11B21/02 , G11B27/36
CPC分类号： G11B27/36 , G11B19/04
摘要： Embodiments of the invention detect a head offset in a data region between servo regions in a data write operation. To detect a head offset even in a data region between servo regions, a magnetic disk drive according to an embodiment of the invention makes adjustments to maintain a fixed relative position between the write head and the read head and reads positional information embedded in certain data by use of the read head until just before writing data. This allows the magnetic disk drive to detect a head offset until just before writing data, leading to enhanced reliability.
摘要翻译：本发明的实施例在数据写入操作中检测伺服区域之间的数据区域中的磁头偏移。为了即使在伺服区域之间的数据区域中检测磁头偏移，根据本发明的实施例的磁盘驱动器进行调整以保持写入头和读取头之间的固定的相对位置，并且通过直到写入数据之前才使用读头。这使得磁盘驱动器能够在写数据之前检测磁头偏移量，从而提高可靠性。

2. 发明申请

US20060126208A1 Disk drive with improved format efficiency and control method thereof 失效
公开(公告)号：US20060126208A1
公开(公告)日：2006-06-15
申请号：US11294996
申请日：2005-12-05
申请人： Nobuhito Kitamura , Hitoshi Yoshida
发明人： Nobuhito Kitamura , Hitoshi Yoshida
IPC分类号： G11B5/09 , G11B15/12 , G11B5/596
CPC分类号： G11B20/1217 , G11B5/3967 , G11B5/59655 , G11B2005/0002 , G11B2020/1277 , G11B2020/1287 , G11B2020/1292 , G11B2220/2516
摘要： Embodiments of the invention provide a magnetic disk drive and its control method capable of effectively using the unrecordable area which is caused due to the composite magnetic head's gap between the read head and the write head. In one embodiment, a disk drive comprises a composite magnetic head structured in such a manner that during write the write head WH reaches each servo area earlier than the read head RH, and a read write control unit to control the write and read done by the composite magnetic head. On the disk, common servo data SP to be used both during read and during write, write servo data SW to be used during write and read servo data SR to be used during read are recorded in this order in each servo area. During write, the read write control unit starts the write head recording data at the timing when reading write servo data SW from the servo area is completed.

3. 发明授权

US07684138B2 Magnetic disk drive, method for registering defective sector, and method for controlling flying height 失效
标题翻译：磁盘驱动器，缺陷扇区的登记方法以及控制飞行高度的方法
公开(公告)号：US07684138B2
公开(公告)日：2010-03-23
申请号：US11607821
申请日：2006-11-30
申请人： Nobuhito Kitamura , Hitoshi Yoshida
发明人： Nobuhito Kitamura , Hitoshi Yoshida
IPC分类号： G11B5/09
CPC分类号： G11B5/40 , G11B5/6011 , G11B20/00963 , G11B20/1816 , G11B20/1879 , G11B2020/1826 , G11B2020/1893 , G11B2220/2516
摘要： Embodiments in accordance with the present invention relate to detecting a micro-relief that exists on surfaces of a magnetic disk. A phase or frequency of a read signal obtained when data written to a minute projection or a minute concavity on a recording surface of a magnetic disk is read out, differs from that of a read signal obtained when data written to a flat recording surface is read out. The phase progresses in the minute projection, whereas the phase is delayed in the minute concavity. A micro-relief is detected by measuring a deviation value of this frequency, and then defect registration is performed. Embodiments in accordance with the present invention are configured to detect a minute projection whose level does not cause TA. Embodiments in accordance with the present invention may also be configured to provide a highly reliable magnetic disk drive by controlling the flying height in response to a state of a minute projection and that of a minute concavity.
摘要翻译：根据本发明的实施例涉及检测存在于磁盘表面上的微型浮雕。读取写入磁盘的记录表面上的微小凸起或微小凹陷的数据时获得的读取信号的相位或频率不同于读取写入平面记录表面的数据时获得的读取信号的相位或频率出来相位在微小投影中进行，而相位在微小凹凸中延迟。通过测量该频率的偏差值来检测微小浮雕，然后进行缺陷配准。根据本发明的实施例被配置为检测其电平不引起TA的微小投影。根据本发明的实施例还可以被配置为通过响应于微小突起的状态和微小凹凸的状态来控制飞行高度来提供高度可靠的磁盘驱动器。

4. 发明授权

US07570446B2 Disk drive with improved format efficiency and control method thereof 失效
标题翻译：具有改进格式效率的磁盘驱动器及其控制方法
公开(公告)号：US07570446B2
公开(公告)日：2009-08-04
申请号：US11294996
申请日：2005-12-05
申请人： Nobuhito Kitamura , Hitoshi Yoshida
发明人： Nobuhito Kitamura , Hitoshi Yoshida
IPC分类号： G11B5/09
CPC分类号： G11B20/1217 , G11B5/3967 , G11B5/59655 , G11B2005/0002 , G11B2020/1277 , G11B2020/1287 , G11B2020/1292 , G11B2220/2516
摘要： Embodiments of the invention provide a magnetic disk drive and its control method capable of effectively using the unrecordable area which is caused due to the composite magnetic head's gap between the read head and the write head. In one embodiment, a disk drive comprises a composite magnetic head structured in such a manner that during write the write head WH reaches each servo area earlier than the read head RH, and a read write control unit to control the write and read done by the composite magnetic head. On the disk, common servo data SP to be used both during read and during write, write servo data SW to be used during write and read servo data SR to be used during read are recorded in this order in each servo area. During write, the read write control unit starts the write head recording data at the timing when reading write servo data SW from the servo area is completed.
摘要翻译：本发明的实施例提供一种磁盘驱动器及其控制方法，其能够有效地利用由于读取头和写入头之间的复合磁头的间隙引起的不可记录区域。在一个实施例中，磁盘驱动器包括复合磁头，其以这样的方式构造，使得在写头期间写入头WH比读取磁头RH更早地到达每个伺服区域;以及读写控制单元，用于控制写入和写操作复合磁头。在磁盘上，在读取期间和写入期间都要使用的公用伺服数据SP在读取期间写入和读取伺服数据SR期间使用的写入伺服数据SW以该顺序被记录在每个伺服区域中。在写入期间，读取写入控制单元在从伺服区域读取写入伺服数据SW完成的定时开始写入头记录数据。

5. 发明申请

US20070053094A1 Magnetic disk drive with error correction 有权
标题翻译：磁盘驱动器，具有纠错功能
公开(公告)号：US20070053094A1
公开(公告)日：2007-03-08
申请号：US11516109
申请日：2006-09-05
申请人： Nobuhito Kitamura , Hitoshi Yoshida , Noriyuki Sumiya
发明人： Nobuhito Kitamura , Hitoshi Yoshida , Noriyuki Sumiya
IPC分类号： G11B5/09 , G11B5/02
CPC分类号： G11B20/18 , G11B2220/2516
摘要： Embodiments of the present invention provide a magnetic disk drive in which the error correction capability of ECC is improved without sacrificing the storage capacity. In one embodiment, a data track adopts a format structure in which no data-to-data gap area is formed in data sectors. When one of the data sectors is updated in a state in which the rotational speed of a magnetic disk does not satisfy specified conditions, a leading end area of a succeeding data sector or a trailing end area of a preceding data sector is overwritten by the data sector. If a read error occurs in the overwritten data sector, ERP steps are executed to perform read retry so that the read error is recovered by means of on-the-fly ECC or erasure correction. In the case of the erasure correction, an erasure pointer equivalent to the maximum number of overwritten bytes is set.
摘要翻译：本发明的实施例提供了一种在不牺牲存储容量的情况下改进ECC的纠错能力的磁盘驱动器。在一个实施例中，数据轨道采用其中在数据扇区中不形成数据到数据间隙区域的格式结构。当其中一个数据扇区在磁盘的转速不满足规定条件的状态下更新时，前一数据扇区的后端数据扇区的前端区域或后端区域的前端区域被数据覆盖部门。如果覆盖数据扇区发生读取错误，则执行ERP步骤执行读取重试，以便通过即时ECC或擦除校正来恢复读取错误。在擦除校正的情况下，设置等于最大重写字节数的擦除指针。

6. 发明申请

US20060126213A1 Magnetic disk drive with offset detection of composite magnetic head 有权
标题翻译：磁盘驱动器，具有复合磁头的偏移检测
公开(公告)号：US20060126213A1
公开(公告)日：2006-06-15
申请号：US11304203
申请日：2005-12-14
申请人： Nobuhito Kitamura , Noriyuki Sumiya
发明人： Nobuhito Kitamura , Noriyuki Sumiya
IPC分类号： G11B21/02 , G11B27/36
CPC分类号： G11B27/36 , G11B19/04
摘要： Embodiments of the invention detect a head offset in a data region between servo regions in a data write operation. To detect a head offset even in a data region between servo regions, a magnetic disk drive according to an embodiment of the invention makes adjustments to maintain a fixed relative position between the write head and the read head and reads positional information embedded in certain data by use of the read head until just before writing data. This allows the magnetic disk drive to detect a head offset until just before writing data, leading to enhanced reliability.
摘要翻译：本发明的实施例在数据写入操作中检测伺服区域之间的数据区域中的磁头偏移。为了即使在伺服区域之间的数据区域中检测磁头偏移，根据本发明的实施例的磁盘驱动器进行调整以保持写入头和读取头之间的固定的相对位置，并且通过直到写入数据之前才使用读头。这使得磁盘驱动器能够在写数据之前检测磁头偏移量，从而提高可靠性。

7. 发明授权

US07885027B2 Magnetic disk drive with error correction 有权
标题翻译：磁盘驱动器，具有纠错功能
公开(公告)号：US07885027B2
公开(公告)日：2011-02-08
申请号：US11516109
申请日：2006-09-05
申请人： Nobuhito Kitamura , Hitoshi Yoshida , Noriyuki Sumiya
发明人： Nobuhito Kitamura , Hitoshi Yoshida , Noriyuki Sumiya
IPC分类号： G11B5/09 , G11B27/36
CPC分类号： G11B20/18 , G11B2220/2516
摘要： Embodiments of the present invention provide a magnetic disk drive in which the error correction capability of ECC is improved without sacrificing the storage capacity. In one embodiment, a data track adopts a format structure in which no data-to-data gap area is formed in data sectors. When one of the data sectors is updated in a state in which the rotational speed of a magnetic disk does not satisfy specified conditions, a leading end area of a succeeding data sector or a trailing end area of a preceding data sector is overwritten by the data sector. If a read error occurs in the overwritten data sector, ERP steps are executed to perform read retry so that the read error is recovered by means of on-the-fly ECC or erasure correction. In the case of the erasure correction, an erasure pointer equivalent to the maximum number of overwritten bytes is set.
摘要翻译：本发明的实施例提供了一种在不牺牲存储容量的情况下改进ECC的纠错能力的磁盘驱动器。在一个实施例中，数据轨道采用其中在数据扇区中不形成数据到数据间隙区域的格式结构。当其中一个数据扇区在磁盘的转速不满足规定条件的状态下更新时，前一数据扇区的后端数据扇区的前端区域或后端区域的前端区域被数据覆盖部门。如果覆盖数据扇区发生读取错误，则执行ERP步骤执行读取重试，以便通过即时ECC或擦除校正来恢复读取错误。在擦除校正的情况下，设置等于最大重写字节数的擦除指针。

8. 发明授权

US07586707B2 Magnetic disk drive with increased storage capacity 失效
标题翻译：具有增加存储容量的磁盘驱动器
公开(公告)号：US07586707B2
公开(公告)日：2009-09-08
申请号：US11544883
申请日：2006-10-05
申请人： Hitoshi Yoshida , Noriyuki Sumiya , Nobuhito Kitamura
发明人： Hitoshi Yoshida , Noriyuki Sumiya , Nobuhito Kitamura
IPC分类号： G11B5/09
CPC分类号： G11B5/09 , G11B20/10 , H03L7/06
摘要： Embodiments of the invention provide a magnetic disk drive capable of reducing an area used for a preamble of each data sector to increase the storage capacity. The magnetic disk drive adopts a data-surface servo system. In one embodiment, main preambles are written on a magnetic disk at a frequency of a data clock. Each of data sectors is written with a write clock that is synchronized with a signal obtained by reading the main preamble. The data sectors include sub preambles respectively. When the data sector which has been written in this manner is read, a read clock is synchronized by use of a signal obtained by reading the main preamble, and a signal obtained by reading the sub preamble included in a data sector to be read. The bit length of the sub preamble is shorter than that of the conventional preamble that is used to independently achieve the synchronization. Accordingly, an area whose length is calculated by summing the bit length of the main preamble and that of the sub preamble becomes smaller than an area whose length is calculated by summing the bit length of the conventional preambles.
摘要翻译：本发明的实施例提供一种磁盘驱动器，其能够减少用于每个数据扇区的前导码的区域以增加存储容量。磁盘驱动器采用数据表面伺服系统。在一个实施例中，以数据时钟的频率将主要前导码写入磁盘。写入每个数据扇区的写入时钟与通过读取主前导码获得的信号同步。数据扇区分别包括子前导码。当读取以这种方式写入的数据扇区时，通过使用通过读取主前导码获得的信号和通过读取包括在要读取的数据扇区中的子前导码而获得的信号来同步读取时钟。子前导码的比特长度比用于独立地实现同步的常规前导码的比特长度短。因此，通过将主前同步码的比特长度和子前导码的比特长度相加来计算长度的区域比通过对常规前导码比特长度求和来计算长度的区域小。

9. 发明申请

US20070146920A1 Magnetic disk drive, method for registering defective sector, and method for controlling flying height 失效
标题翻译：磁盘驱动器，缺陷扇区的登记方法以及控制飞行高度的方法
公开(公告)号：US20070146920A1
公开(公告)日：2007-06-28
申请号：US11607821
申请日：2006-11-30
申请人： Nobuhito Kitamura , Hitoshi Yoshida
发明人： Nobuhito Kitamura , Hitoshi Yoshida
IPC分类号： G11B5/09 , G11B27/36 , G11B21/02
CPC分类号： G11B5/40 , G11B5/6011 , G11B20/00963 , G11B20/1816 , G11B20/1879 , G11B2020/1826 , G11B2020/1893 , G11B2220/2516
摘要： Embodiments in accordance with the present invention relate to detecting a micro-relief that exists on surfaces of a magnetic disk. A phase or frequency of a read signal obtained when data written to a minute projection or a minute concavity on a recording surface of a magnetic disk is read out, differs from that of a read signal obtained when data written to a flat recording surface is read out. The phase progresses in the minute projection, whereas the phase is delayed in the minute concavity. A micro-relief is detected by measuring a deviation value of this frequency, and then defect registration is performed. Embodiments in accordance with the present invention are configured to detect a minute projection whose level does not cause TA. Embodiments in accordance with the present invention may also be configured to provide a highly reliable magnetic disk drive by controlling the flying height in response to a state of a minute projection and that of a minute concavity.
摘要翻译：根据本发明的实施例涉及检测存在于磁盘表面上的微型浮雕。读取写入磁盘的记录表面上的微小凸起或微小凹陷的数据时获得的读取信号的相位或频率不同于读取写入平面记录表面的数据时获得的读取信号的相位或频率出来相位在微小投影中进行，而相位在微小凹凸中延迟。通过测量该频率的偏差值来检测微小浮雕，然后进行缺陷配准。根据本发明的实施例被配置为检测其电平不引起TA的微小投影。根据本发明的实施例还可以被配置为通过响应于微小突起的状态和微小凹凸的状态来控制飞行高度来提供高度可靠的磁盘驱动器。

10. 发明申请

US20070081267A1 Magnetic disk drive with increased storage capacity 失效
标题翻译：具有增加存储容量的磁盘驱动器
公开(公告)号：US20070081267A1
公开(公告)日：2007-04-12
申请号：US11544883
申请日：2006-10-05
申请人： Hitoshi Yoshida , Noriyuki Sumiya , Nobuhito Kitamura
发明人： Hitoshi Yoshida , Noriyuki Sumiya , Nobuhito Kitamura
IPC分类号： G11B5/09 , G11B21/02
CPC分类号： G11B5/09 , G11B20/10 , H03L7/06
摘要： Embodiments of the invention provide a magnetic disk drive capable of reducing an area used for a preamble of each data sector to increase the storage capacity. The magnetic disk drive adopts a data-surface servo system. In one embodiment, main preambles are written on a magnetic disk at a frequency of a data clock. Each of data sectors is written with a write clock that is synchronized with a signal obtained by reading the main preamble. The data sectors include sub preambles respectively. When the data sector which has been written in this manner is read, a read clock is synchronized by use of a signal obtained by reading the main preamble, and a signal obtained by reading the sub preamble included in a data sector to be read. The bit length of the sub preamble is shorter than that of the conventional preamble that is used to independently achieve the synchronization. Accordingly, an area whose length is calculated by summing the bit length of the main preamble and that of the sub preamble becomes smaller than an area whose length is calculated by summing the bit length of the conventional preambles.
摘要翻译：本发明的实施例提供一种磁盘驱动器，其能够减少用于每个数据扇区的前导码的区域以增加存储容量。磁盘驱动器采用数据表面伺服系统。在一个实施例中，以数据时钟的频率将主要前导码写入磁盘。写入每个数据扇区的写入时钟与通过读取主前导码获得的信号同步。数据扇区分别包括子前导码。当读取以这种方式写入的数据扇区时，通过使用通过读取主前导码获得的信号和通过读取包括在要读取的数据扇区中的子前导码而获得的信号来同步读取时钟。子前导码的比特长度比用于独立地实现同步的常规前导码的比特长度短。因此，通过将主前同步码的比特长度和子前导码的比特长度相加来计算长度的区域比通过对常规前导码比特长度求和来计算长度的区域小。

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