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    • 33. 发明授权
    • Perpendicular magnetic recording head, magnetic head, and magnetic disk device mounted with these heads
    • 垂直磁记录头,磁头和安装这些磁头的磁盘装置
    • US08339749B2
    • 2012-12-25
    • US12313410
    • 2008-11-19
    • Masafumi MochizukiHideaki MaedaShuji NishidaTakaaki Izumida
    • Masafumi MochizukiHideaki MaedaShuji NishidaTakaaki Izumida
    • G02B5/32G02F1/00
    • G11B5/3116B82Y10/00B82Y25/00G11B5/1278G11B5/3909G11B5/3967G11B2005/3996
    • Embodiments of the invention reduce generation of a magnetic field with a polarity reverse to that of the recording magnetic field, without deteriorating a gradient in the magnetic field. An embodiment of a magnetic disk device according to the present invention suppresses deviation and erase of already recorded data. In an embodiment, the perpendicular magnetic recording head includes the main magnetic pole, an auxiliary magnetic pole, a trailing shield disposed on the trailing side of the main magnetic pole with a non-magnetic film placed in-between, and side shields disposed on both the sides of the main magnetic pole in the direction of the track width with a non-magnetic film placed in-between. The trailing shield has on the trailing side a portion where film thickness is thinner on the trailing side than the thickness of its element in the height direction in its position facing the main magnetic pole. Adoption of this configuration allows suppression of generation of the magnetic field having a polarity reverse to that of the recording magnetic field, without deteriorating the magnetic field gradient. Also in the portion where the side shields face the main magnetic pole, the side shields have the portion where the film is thinned down in thickness.
    • 本发明的实施例减少了与记录磁场相反极性的磁场的产生,而不会使磁场中的梯度恶化。 根据本发明的磁盘装置的实施例抑制已经记录的数据的偏差和擦除。 在一个实施例中,垂直磁记录头包括主磁极,辅助磁极,设置在主磁极的后侧的后屏蔽件,其中放置有非磁性薄膜和设置在两者上的侧屏蔽 主磁极的侧面在磁道宽度方向上放置非磁性膜。 后挡板在其后侧具有在其后侧的膜厚度比其元件在其与主磁极相对的位置的高度方向上的厚度更薄的部分。 采用这种配置允许抑制具有与记录磁场相反的极性的磁场的产生,而不会降低磁场梯度。 另外在侧面屏蔽面对主磁极的部分,侧面屏蔽部分的薄膜部分厚度变薄。
    • 36. 发明授权
    • Magnetic disk drive having assisted recording and methods of recording data thereto
    • 辅助记录的磁盘驱动器和记录数据的方法
    • US07969678B2
    • 2011-06-28
    • US12615219
    • 2009-11-09
    • Hiroyasu TanabeHideaki MaedaHideki ZaitsuMasafumi Mochizuki
    • Hiroyasu TanabeHideaki MaedaHideki ZaitsuMasafumi Mochizuki
    • G11B27/36
    • G11B5/012G11B5/09G11B5/455G11B2005/0005G11B2005/0021
    • In one embodiment, a magnetic disk drive includes a magnetic disk, a head slider for flying above the spinning magnetic disk, a pattern analyzer for analyzing a data pattern of data to be recorded on the magnetic disk to determine a recording current reversal timing and a recording assistance area in accordance with the analysis so that the rear end of the determined recording assistance area is shifted forward if the determined recording current reversal timing is earlier than a criterion, or the rear end of the determined recording assistance area is shifted backward if the determined recording current reversal timing is later than the criterion, a recording assistance element on the slider for forming the determined recording assistance area on the magnetic disk, and a recording element for recording the data on the magnetic disk using the recording current in accordance with the determined recording current reversal timing.
    • 在一个实施例中,磁盘驱动器包括磁盘,用于在旋转磁盘上方飞行的磁头滑块,用于分析要记录在磁盘上的数据的数据模式以确定记录电流反转定时的模式分析器,以及 记录辅助区域,如果所确定的记录电流反转定时早于标准,则确定的记录辅助区域的后端向前移动,或者如果确定的记录辅助区域的后端如果 确定的记录电流反转时间晚于该标准,用于在磁盘上形成确定的记录辅助区域的滑块上的记录辅助元件,以及用于使用记录电流将数据记录在磁盘上的记录元件 确定记录电流反转时序。
    • 37. 发明申请
    • MAGNETIC DISK DRIVE AND DATA REWRITE METHODS
    • 磁盘驱动器和数据恢复方法
    • US20100321817A1
    • 2010-12-23
    • US12822130
    • 2010-06-23
    • Toru AidaShuhsuke KuriharaToshihiko TsunokawaHideaki Maeda
    • Toru AidaShuhsuke KuriharaToshihiko TsunokawaHideaki Maeda
    • G11B15/04
    • G11B20/18G11B5/09G11B2020/1869G11B2220/2516
    • In one embodiment, a magnetic disk drive includes a magnetic disk having data tracks, a magnetic head, a motion mechanism for moving the magnetic head, and a controller. The controller adds a value to a rewrite parameter for a rewrite region based on a number of writes to data tracks related to the rewrite region, the value is chosen to reflect a degree of influence the number of writes have on the rewrite region, and the magnetic head rewrites data of the rewrite region when the rewrite parameter is greater than a threshold. In another embodiment, a method includes writing data tracks in a rewrite region, defining values reflecting a degree(s) of influence on the rewrite region, adding the values to a rewrite parameter upon writing data to the data tracks, determining that the rewrite parameter has reached or exceeded a threshold and rewriting data in the rewrite region.
    • 在一个实施例中,磁盘驱动器包括具有数据磁道的磁盘,磁头,用于移动磁头的运动机构和控制器。 控制器基于对与重写区域相关的数据轨迹的写入次数,向重写区域的重写参数添加值,该值被选择以反映写入次数对重写区域的影响程度,并且 当重写参数大于阈值时,磁头重写重写区域的数据。 在另一个实施例中,一种方法包括在重写区域中写入数据轨迹,定义反映对重写区域的影响程度的值,在将数据写入数据轨道时将该值添加到重写参数,确定重写参数 已达到或超过阈值并重写重写区域中的数据。