Actuation efficiency based contact detection
    2.
    发明授权
    Actuation efficiency based contact detection 失效
    基于动作效率的接触检测

    公开(公告)号:US07558015B2

    公开(公告)日:2009-07-07

    申请号:US11693596

    申请日:2007-03-29

    IPC分类号: G11B21/02

    摘要: In one example, a method is provided and includes comparing a measured change in spacing between a transducer element and a storage element in response to a fly height control signal with an expected change in spacing for the applied fly height control signal. The method also includes detecting an event condition based on the comparison between the measured change in spacing and the expected change in spacing.

    摘要翻译: 在一个示例中,提供了一种方法,并且包括响应于飞行高度控制信号,比较所测量的换能器元件和存储元件之间的间隔的变化,以及所应用的飞行高度控制信号的间隔的预期变化。 该方法还包括基于所测量的间隔变化与间隔的期望变化之间的比较来检测事件条件。

    Hindering PTP in a hard disk
    3.
    发明授权
    Hindering PTP in a hard disk 有权
    在硬盘中阻止PTP

    公开(公告)号:US06717759B1

    公开(公告)日:2004-04-06

    申请号:US10076592

    申请日:2002-02-19

    IPC分类号: G11B2736

    摘要: A hard disk is provided with tools for limiting the duty cycle (a group of variations of load with time). The write current is controlled by, e.g., limiting the duration of a given write cycle. The write cycle may involve writing data continuously along adjacent portions of the disk media (e.g., writing of data in adjacent segments of a track in the outer diameter (OD) region of a platter), with an intermittent duty write current.

    摘要翻译: 硬盘提供了用于限制占空比的工具(一组负载随时间变化)。 写入电流由例如限制给定写周期的持续时间来控制。 写周期可以包括沿着盘介质的相邻部分连续地写入数据(例如,在间隔的占空比写入电流中,在盘的外径(OD)区域中的轨道的相邻段中写入数据)。

    Disk drive adjusting fly height actuator to compensate for laser induced head protrusion in heat assisted magnetic recording
    4.
    发明授权
    Disk drive adjusting fly height actuator to compensate for laser induced head protrusion in heat assisted magnetic recording 有权
    磁盘驱动器调节飞行高度执行器,以补偿热辅助磁记录中的激光感应头突出

    公开(公告)号:US08619508B1

    公开(公告)日:2013-12-31

    申请号:US13556132

    申请日:2012-07-23

    IPC分类号: G11B11/00

    摘要: A disk drive is disclosed comprising a head actuated over a disk, wherein the head comprises a laser operable to heat the disk while writing data to the disk, and a fly height actuator (FHA) operable to adjust a fly height of the head over the disk. When a write command is received to write data to a target data track, the head is positioned over the target data track. When the head approaches a target data sector of the target data track, a power applied to the FHA is increased to decrease the fly height of the head. When the head reaches the target data sector, a power applied to the laser is increased to heat the disk, and the power applied to the FHA is decreased substantially monotonically while writing data to the target data sector.

    摘要翻译: 公开了一种磁盘驱动器,其包括在磁盘上致动的磁头,其中所述磁头包括可操作以在将数据写入所述磁盘的同时加热所述磁盘的激光器;以及飞行高度致动器(FHA),其可操作以调整所述磁头 磁盘。 当接收写入命令以将数据写入目标数据轨道时,头部位于目标数据轨道上方。 当头部接近目标数据轨道的目标数据扇区时,增加施加到FHA的功率以降低头部的飞行高度。 当头到达目标数据扇区时,增加施加到激光器的功率以加热盘,并且施加到FHA的功率在将数据写入目标数据扇区的同时基本上单调地减小。

    Adaptive read bias
    5.
    发明授权
    Adaptive read bias 有权
    自适应读偏

    公开(公告)号:US07667934B1

    公开(公告)日:2010-02-23

    申请号:US11449575

    申请日:2006-06-07

    申请人: Davide Guarisco

    发明人: Davide Guarisco

    IPC分类号: G11B5/39

    摘要: A read system for a hard disk drive comprising a disk having magnetic fields. The read system comprises a read element, a bias source, a temperature sensor, and a controller. The resistance of the read element changes based on the magnetic fields. The bias source applies a bias level to the read element. The temperature sensor generates a temperature signal indicative of a head ambient temperature. The controller adapts the bias level based on the temperature signal.

    摘要翻译: 一种用于硬盘驱动器的读取系统,包括具有磁场的磁盘。 读取系统包括读取元件,偏置源,温度传感器和控制器。 读取元件的电阻基于磁场而变化。 偏置源将偏置电平应用于读取元件。 温度传感器产生指示头部环境温度的温度信号。 控制器根据温度信号调整偏置电平。