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    MAGNETIC DISK DEVICE AND SSW METHOD
    1.
    发明公开
    MAGNETIC DISK DEVICE AND SSW METHOD 审中-公开

    公开(公告)号：US20230206949A1

    公开(公告)日：2023-06-29

    申请号：US17892947

    申请日：2022-08-22

    Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

    Inventor： Takahiro AOKI

    IPC: G11B5/596 ,  G11B5/02

    CPC classification number: G11B5/59638 ,  G11B5/59627 ,  G11B5/02

    Abstract: According to one embodiment, a magnetic disk device comprises a disk, a first head, a second head, a controller. The disk includes a first surface and a second surface different from the first surface. The first head carries out read and write of data from and to the first surface. The second head carries out read and write of data from and to the second surface. The controller adjusts a spiral speed of at least one of the first head and the second head according to a cylinder offset amount corresponding to a positional difference between the first head and the second head. The spiral speed is a speed at which spiral servo patterns are to be written.

    Disk drive performing spiral scan of disk surface to detect residual data
    8.
    发明授权
    Disk drive performing spiral scan of disk surface to detect residual data 有权
    磁盘驱动器执行磁盘表面的螺旋扫描以检测残留数据

    公开(公告)号：US08896957B1

    公开(公告)日：2014-11-25

    申请号：US13922935

    申请日：2013-06-20

    Applicant: Western Digital Technologies, Inc.

    Inventor： Yap Han Ng ,  Charles A. Park ,  Songwut Jomthaisong ,  Siri S. Weerasooriya ,  Brian P. Rigney

    IPC: G11B5/03 ,  G11B21/02 ,  G11B27/36 ,  G11B5/024

    CPC classification number: G11B5/024 ,  G11B5/59638

    Abstract: A disk drive is disclosed comprising a disk surface comprising a radius, a head operable to generate a read signal, and a voice coil motor (VCM) operable to actuate the head over the disk surface. A back electromotive force (BEMF) voltage generated by the VCM is measured. The VCM is controlled to move the head over substantially the entire radius of the disk surface in response to the BEMF voltage, and while moving the head the read signal from the head is processed to detect residual data recorded on the disk surface after erasing the disk surface.

    Abstract translation: 公开了一种磁盘驱动器，其包括盘表面，该盘表面包括半径，可操作以产生读取信号的头部以及可操作以使磁头在磁盘表面上起动的音圈电机（VCM）。 测量由VCM产生的反电动势（BEMF）电压。 控制VCM以响应于BEMF电压将头部移动到基本上在盘表面的整个半径上，并且在移动头部时，处理来自头部的读取信号以在擦除盘片之后检测记录在盘表面上的残留数据 表面。

    Waveguide with blocking layer
    9.
    发明授权
    Waveguide with blocking layer 有权
    带阻挡层的波导

    公开(公告)号：US08787126B2

    公开(公告)日：2014-07-22

    申请号：US13269809

    申请日：2011-10-10

    Applicant: Nils Jan Gokemeijer ,  William Albert Challener

    Inventor： Nils Jan Gokemeijer ,  William Albert Challener

    IPC: G11B11/105 ,  G11B5/127

    CPC classification number: G11B5/314 ,  G11B5/59638 ,  G11B2005/0021

    Abstract: An apparatus includes a write pole, a waveguide adjacent to the write pole, the waveguide having a truncated end, and a blocking layer positioned adjacent the truncated end and extending from one side of the waveguide across a portion of an aperture at the truncated end. The waveguide can be a solid immersion mirror or a channel waveguide.

    Abstract translation: 一种装置包括写极，邻近写磁极的波导，波导具有截头端，以及阻挡层，其邻近截顶端并且从波导的一侧延伸穿过截头端的孔的一部分。 波导可以是固体浸没镜或通道波导。

    Spiral band end detection
    10.
    发明授权
    Spiral band end detection 有权
    螺旋带末端检测

    公开(公告)号：US08767340B1

    公开(公告)日：2014-07-01

    申请号：US13494487

    申请日：2012-06-12

    Applicant: Perry Neos ,  Luan Ton-That ,  Man Cheung

    Inventor： Perry Neos ,  Luan Ton-That ,  Man Cheung

    IPC: G11B21/02 ,  G11B5/596 ,  G11B15/12

    CPC classification number: G11B5/59661 ,  G11B5/5526 ,  G11B5/5534 ,  G11B5/5543 ,  G11B5/596 ,  G11B5/59638

    Abstract: Methods, systems and computer program products for detecting an end of a reference spiral band are described. A first portion of servo information may be written on a disk using the reference spiral band. By detecting an end of a reference spiral band, a new reference spiral band may be launched. A read/write head of a hard disk drive may subsequently use the new spiral band to write the remaining portion of the servo information, which aids the writing of data tracks on the disk.

    Abstract translation: 描述了用于检测参考螺旋带的末端的方法，系统和计算机程序产品。 伺服信息的第一部分可以使用参考螺旋带写在盘上。 通过检测参考螺旋带的结束，可以启动新的参考螺旋带。 硬盘驱动器的读/写头可以随后使用新的螺旋带来写入伺服信息的剩余部分，这有助于将数据轨迹写入盘上。

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