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1. 发明授权

US10777227B2 Magnetic disk device and control method 有权
公开(公告)号：US10777227B2
公开(公告)日：2020-09-15
申请号：US16299839
申请日：2019-03-12
申请人： Kabushiki Kaisha Toshiba , Toshiba Electronic Devices & Storage Corporation
发明人： Kazuto Kashiwagi , Kazuhito Shimomura
IPC分类号： G11B20/18 , G11B27/36 , G11B5/012
摘要： According to an embodiment, the magnetic disk device includes a disk medium and a control circuit. The disk medium includes a first region including a first track. The control circuit controls a write operation of first data to the first track, executes error correction coding of the first data during the write operation. The control circuit makes first determination on whether the written first data is protected by an error correction code. The control circuit sets a second track in a location adjacent to the first track in accordance with a result of the first determination.

2. 发明申请

US20200090699A1 MAGNETIC DISK DEVICE AND CONTROL METHOD 审中-公开
公开(公告)号：US20200090699A1
公开(公告)日：2020-03-19
申请号：US16299839
申请日：2019-03-12
申请人： Kabushiki Kaisha Toshiba , Toshiba Electronic Devices & Storage Corporation
发明人： Kazuto Kashiwagi , Kazuhito Shimomura
IPC分类号： G11B20/18 , G11B5/012
摘要： According to an embodiment, the magnetic disk device includes a disk medium and a control circuit. The disk medium includes a first region including a first track. The control circuit controls a write operation of first data to the first track, executes error correction coding of the first data during the write operation. The control circuit makes first determination on whether the written first data is protected by an error correction code. The control circuit sets a second track in a location adjacent to the first track in accordance with a result of the first determination.

3. 发明授权

US09171558B2 Magnetic head with multiple reproducing elements each having magnetically coupled free layers, magnetic recording reproducing apparatus and magnetic head manufacturing method 有权
标题翻译：具有各自具有磁耦合自由层的多个再现元件的磁头，磁记录再现装置和磁头制造方法
公开(公告)号：US09171558B2
公开(公告)日：2015-10-27
申请号：US14152974
申请日：2014-01-10
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Akihiko Takeo , Kazuto Kashiwagi , Kenichiro Yamada , Katsuhiko Koui , Tomomi Funayama
IPC分类号： G11B5/39 , G11B5/31 , G11B5/29 , G11B5/48 , G11B5/49
CPC分类号： G11B5/3163 , G11B5/29 , G11B5/3909 , G11B5/3912 , G11B5/3932 , G11B5/3958 , G11B5/4886 , G11B5/4976
摘要： A magnetic head includes a plurality of reproducing elements so that the magnetic head can acquire reproduction signals from a plurality of tracks at the same time. The magnetic head includes a first reproducing element, a first magnetic film formed on a first side wall of the first reproducing element with a first side wall insulating film interposed therebetween, a second magnetic film formed on a second side wall of the first reproducing element with a second side wall insulating film interposed therebetween, a second reproducing element electrically isolated from the first reproducing element and formed on the first magnetic film, a third magnetic film formed on the first magnetic film, and a fourth magnetic film formed on the first reproducing element and electrically isolated from the second reproducing element.
摘要翻译：磁头包括多个再现元件，使得磁头可以同时从多个轨道获取再现信号。磁头包括第一再现元件，形成在第一再现元件的第一侧壁上的第一磁性膜，其间插入有第一侧壁绝缘膜，形成在第一再现元件的第二侧壁上的第二磁性膜，介于其间的第二侧壁绝缘膜，与第一再现元件电隔离并形成在第一磁性膜上的第二再现元件，形成在第一磁性膜上的第三磁性膜和形成在第一再现元件上的第四磁性膜并且与第二再现元件电隔离。

4. 发明授权

US08786971B2 Magnetic recording apparatus having variable-width tracks and method of testing same 失效
标题翻译：具有可变宽度磁道的磁记录装置及其测试方法
公开(公告)号：US08786971B2
公开(公告)日：2014-07-22
申请号：US14175178
申请日：2014-02-07
申请人： Kabushiki Kaisha Toshiba
发明人： Masatoshi Sakurai , Kazuto Kashiwagi , Naoki Tagami
IPC分类号： G11B5/09 , G11B5/82 , G11B5/706
CPC分类号： G11B20/1816 , B82Y10/00 , G11B5/455 , G11B5/6011 , G11B5/746 , G11B19/048 , G11B27/36
摘要： According to one embodiment, there is provided a magnetic recording apparatus including a head slider including read and write elements, and a magnetic recording medium including magnetically recordable recording tracks with a width L1, a wide land track with a width L2 larger than the width L1 of the recording track, and non-recording sections with a width G1 each provided between adjacent recording tracks. The width L1 of the recording track is smaller than a bottom read width BRW of the read and write elements, and the width L2 of the wide land track is larger than the bottom read width BRW of the read and write elements.
摘要翻译：根据一个实施例，提供一种磁记录装置，其包括具有读和写元件的磁头滑块，以及包括具有宽度L1的磁性可记录记录磁道的磁记录介质，宽度L2大于宽度L1的宽的磁道轨迹以及各自设置在相邻记录轨道之间的具有宽度G1的非记录部分。记录磁道的宽度L1小于读取和写入元件的底部读取宽度BRW，并且宽焊盘磁道的宽度L2大于读取和写入元件的底部读取宽度BRW。

5. 发明授权

US10460761B2 Defect registration method 有权
公开(公告)号：US10460761B2
公开(公告)日：2019-10-29
申请号：US16116237
申请日：2018-08-29
申请人： Kabushiki Kaisha Toshiba , Toshiba Electronic Devices & Storage Corporation
发明人： Kazuto Kashiwagi
IPC分类号： G11B20/18 , G01R33/12
摘要： According to one embodiment, a defect registration method includes measuring, performing first extracting, and registering. The measuring is measuring, on a unit-area basis, performance of a storage area of a magnetic disk including a plurality of unit areas. The storage area includes a redundant area of a set capacity. The first extracting includes second extracting one or more unit areas in order of increasing the performance. The registering is registering the extracted unit areas of the set capacity as defect locations.

6. 发明申请

US20190251997A1 DEFECT REGISTRATION METHOD 审中-公开
公开(公告)号：US20190251997A1
公开(公告)日：2019-08-15
申请号：US16116237
申请日：2018-08-29
申请人： Kabushiki Kaisha Toshiba , Toshiba Electronic Devices & Storage Corporation
发明人： Kazuto Kashiwagi
IPC分类号： G11B20/18 , G01R33/12
摘要： According to one embodiment, a defect registration method includes measuring, performing first extracting, and registering. The measuring is measuring, on a unit-area basis, performance of a storage area of a magnetic disk including a plurality of unit areas. The storage area includes a redundant area of a set capacity. The first extracting includes second extracting one or more unit areas in order of increasing the performance. The registering is registering the extracted unit areas of the set capacity as defect locations.

7. 发明授权

US10121505B1 Hard disk device and method of controlling the same 有权
公开(公告)号：US10121505B1
公开(公告)日：2018-11-06
申请号：US15909536
申请日：2018-03-01
申请人： KABUSHIKI KAISHA TOSHIBA , TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
发明人： Kazuto Kashiwagi
IPC分类号： G11B21/02 , G11B5/596 , G11B20/12
摘要： A hard disk device comprises a scanning mechanism that simultaneously scans a first recording medium surface with a first recording head and a second recording medium surface with a second recording head, a table storing band relative position information for a first band on the first recording medium surface and a second band on the second recording medium surface, and a processor. The processor calculates an inter-plane relative trajectory error between the first and second recording heads, determines a data access order performed by the first recording head on the first band and the second recording head on the second band, based on the band relative position information and the inter-plane relative trajectory error, and causes the first recording head to access a track and the second recording head to access a track in the data access order determined by the determining unit.

8. 发明申请

US20150302876A1 DATA STORAGE APPARATUS AND METHOD FOR CORRECTING REPEATABLE RUNOUT 审中-公开
标题翻译：数据存储装置和校正可重复运行的方法
公开(公告)号：US20150302876A1
公开(公告)日：2015-10-22
申请号：US14475833
申请日：2014-09-03
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Kazuto Kashiwagi , Takeyori Hara , Takayuki Kawabe
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： According to one embodiment, a data storage apparatus includes a disk configured to be recorded correction information corresponding to radial positions of the disk and variation information corresponding to the correction information, each of the correction information being information for correcting a repeatable runout, and each of the variation information being information corresponding to a variation amount of a repeatable runout, and a controller configured to correct a first repeatable runout at a first radial position by using a first correction information and a first variation information which are recorded at a second radial position of the disk, when the head is controlled to be positioned at the first radial position on the disk.
摘要翻译：根据一个实施例，数据存储装置包括被配置为记录对应于盘的径向位置的校正信息的盘和对应于校正信息的变化信息，每个校正信息是用于校正可重复跳动的信息，以及每个所述变化信息是对应于可重复跳动的变化量的信息，以及控制器，被配置为通过使用第一校正信息和第一变化信息来校正第一径向位置处的第一可重复跳动，所述第一校正信息和第一变化信息被记录在第二径向位置当磁头被控制为位于磁盘上的第一径向位置时，磁盘。

9. 发明授权

US10770095B2 Recording density setting method based on linear recording densit and track pitch limiting 有权
公开(公告)号：US10770095B2
公开(公告)日：2020-09-08
申请号：US16286926
申请日：2019-02-27
申请人： Kabushiki Kaisha Toshiba , Toshiba Electronic Devices & Storage Corporation
发明人： Kazuto Kashiwagi
IPC分类号： G11B5/012 , G11B5/82 , G11B5/09 , G11B20/12 , G11B20/18 , G11B5/54
摘要： According to one embodiment, a recording density setting method includes performing first process and performing second process. The first process including recording and reading data on and from a disk medium of a magnetic disk device, and acquiring first information for setting the read data to satisfy a certain quality criterion. The first information represents a first shape of a first plurality of unit regions. Each of the a first plurality of unit regions is a recording region of a unit capacity. The second process includes acquiring second information representing a second shape of the first plurality of unit regions, and setting a recording density on the basis of the second information. The second shape is formed by adding margin regions having the same area to the first plurality of unit regions of the first shape.

10. 发明申请

US20160217815A1 MAGNETIC DISK APPARATUS AND DATA RECORDING METHOD 审中-公开
标题翻译：磁盘设备和数据记录方法
公开(公告)号：US20160217815A1
公开(公告)日：2016-07-28
申请号：US15088952
申请日：2016-04-01
申请人： Kabushiki Kaisha Toshiba
发明人： Masahiro Kanamaru , Kazuto Kashiwagi , Takeyori Hara
IPC分类号： G11B5/596 , G11B20/12
CPC分类号： G11B5/59627 , G11B5/012 , G11B5/596 , G11B5/59688 , G11B19/041 , G11B20/10009 , G11B20/10305 , G11B20/10388 , G11B20/1217 , G11B20/1889 , G11B27/36 , G11B2020/10898 , G11B2020/1238 , G11B2020/1292 , G11B2020/1869
摘要： A magnetic disk apparatus of one of the embodiments stores read position dependency information on read signal quality of a data region at a first track and measures the read signal quality at a predetermined radial position in a second data region of a second track different from the first track. A positioning error of the second data region is determined based on the read position dependency information and the read signal quality at the predetermined radial position. Data is recorded in a recording target data region in a shingled recording so as to prevent data written in the second data region from being overwritten by data in a recording target data region adjacent to the second data region by using the determined positioning error.
摘要翻译：实施例之一的磁盘装置将读取位置相关性信息存储在第一磁道上的数据区域的读取信号质量上，并且测量与第一磁道不同的第二磁道的第二数据区域中的预定径向位置处的读取信号质量跟踪。基于读取的位置依赖性信息和在预定径向位置处的读取信号质量来确定第二数据区域的定位误差。数据被记录在带状闪烁的记录中的记录目标数据区域中，以便通过使用确定的定位误差来防止写入第二数据区域中的数据被与第二数据区域相邻的记录目标数据区域中的数据覆盖。

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