Adaptive threshold for detecting touchdown or contamination
    1.
    发明授权
    Adaptive threshold for detecting touchdown or contamination 有权
    用于检测触地或污染的自适应阈值

    公开(公告)号:US08665546B1

    公开(公告)日:2014-03-04

    申请号:US12684045

    申请日:2010-01-07

    IPC分类号: G11B21/02

    CPC分类号: G11B5/6076 G11B5/607

    摘要: A disk drive is disclosed comprising a disk, a head for writing data to the disk, and control circuitry coupled to the head. The control circuitry is operable to determine a first set of fly height values and determine a threshold based on the first set of fly height values. The control circuitry determines a second set of fly height values, adjusts the threshold based on the second set of fly height values, and detects a head characteristic based on the adjusted threshold. The head characteristic is detected by detecting a head touchdown event and/or detecting contamination related to the head based on the adjusted threshold.

    摘要翻译: 公开了一种磁盘驱动器,其包括盘,用于将数据写入盘的头和耦合到头的控制电路。 控制电路可操作以确定第一组飞行高度值,并基于第一组飞行高度值确定阈值。 控制电路确定第二组飞行高度值,基于第二组飞行高度值来调整阈值,并且基于经调整的阈值检测头部特性。 通过基于经调整的阈值检测头部触地事件和/或检测与头部相关的污染物来检测头部特性。

    Disk drive servoing off of first head while determining fly height for second head
    2.
    发明授权
    Disk drive servoing off of first head while determining fly height for second head 失效
    磁盘驱动器在确定第二个磁头的飞行高度的同时关闭第一个磁头

    公开(公告)号:US07630162B2

    公开(公告)日:2009-12-08

    申请号:US12025676

    申请日:2008-02-04

    IPC分类号: G11B21/02 G11B27/36

    摘要: A method is disclosed for selecting a dynamic fly height (DFH) control setting for a head in a disk drive, the disk drive comprising a plurality of disk surfaces and plurality of respective heads. The method comprises servoing a first head over a first disk surface in response to servo data recorded on the first disk surface, adjusting a DFH control setting for a second head, and while servoing the first head over the first disk surface, detecting whether the second head has contacted a second disk surface.

    摘要翻译: 公开了一种用于选择磁盘驱动器中的磁头的动态飞行高度(DFH)控制设置的方法,该磁盘驱动器包括多个磁盘表面和多个相应磁头。 该方法包括响应于记录在第一盘表面上的伺服数据,在第一盘表面上伺服第一头,调整第二头的DFH控制设置,以及在第一盘表面上伺服第一头,检测第二头 头已经接触到第二个磁盘表面。

    Spiral slope approximation of spiral patterns written to a disk of a disk drive
    3.
    发明授权
    Spiral slope approximation of spiral patterns written to a disk of a disk drive 有权
    将螺旋图案的螺旋斜率近似写入磁盘驱动器的磁盘

    公开(公告)号:US07852592B1

    公开(公告)日:2010-12-14

    申请号:US12021976

    申请日:2008-01-29

    IPC分类号: G11B21/02

    摘要: A disk drive that approximates spiral slope in spiral patterns is disclosed. The disk drive includes a disk having at least one spiral pattern that extends radially across the disk, a head to read a portion of the at least one spiral pattern, and a processor to approximate a spiral slope of the portion of the at least one spiral pattern. The processor approximates the spiral slope of the portion of the at least one spiral pattern by implementing operations including: reading amplitude values for the portion of the at least one spiral pattern; determining an amplitude value distribution based on the amplitude values; determining a curve-fitted function for the amplitude value distribution; and determining an approximate spiral slope based on the curve-fitted function.

    摘要翻译: 公开了以螺旋图案近似螺旋斜率的磁盘驱动器。 磁盘驱动器包括具有径向延伸穿过磁盘的至少一个螺旋图案的磁盘,用于读取至少一个螺旋图案的一部分的磁头,以及处理器,用于近似该至少一个螺旋部分的螺旋斜面 模式。 处理器通过实现以下操作来近似该至少一个螺旋图案的部分的螺旋斜率:包括:读取该至少一个螺旋图案的该部分的振幅值; 基于振幅值确定振幅值分布; 确定振幅值分布的曲线拟合函数; 并基于曲线拟合函数确定近似螺旋斜率。

    Disk drive writing spiral tracks on a slave surface using repeatable runout compensation for a master surface
    4.
    发明授权
    Disk drive writing spiral tracks on a slave surface using repeatable runout compensation for a master surface 失效
    磁盘驱动器使用主表面的可重复的跳动补偿在从站表面上写入螺旋轨迹

    公开(公告)号:US08537486B2

    公开(公告)日:2013-09-17

    申请号:US13207332

    申请日:2011-08-10

    IPC分类号: G11B5/02

    摘要: A method is disclosed of servo writing a disk drive comprising a first head actuated over a first disk surface, and a second head actuated over a second disk surface. A first repeatable runout (RRO) of the first disk surface is measured, and a seek is performed to seek the first head over the first disk surface in response to the measured first RRO while writing a first spiral track to the second disk surface using the second head. As a result, the first spiral track comprises a second RRO that substantially matches the first RRO of the first disk surface.

    摘要翻译: 公开了一种伺服写入磁盘驱动器的方法,所述磁盘驱动器包括在第一磁盘表面上致动的第一磁头和在第二磁盘表面上致动的第二磁头。 测量第一磁盘表面的第一可重复跳动(RRO),并且执行搜索以响应于测量的第一RRO在第一磁盘表面上寻找第一磁头,同时使用第一磁盘表面向第二磁盘表面写入第一螺旋磁道 第二个头。 结果,第一螺旋轨道包括与第一盘表面的第一RRO基本匹配的第二RRO。

    Disk drive estimating repeatable runout of reference pattern based on repeatable runout of phase error
    5.
    发明授权
    Disk drive estimating repeatable runout of reference pattern based on repeatable runout of phase error 失效
    基于相位误差的可重复跳动,磁盘驱动器估计参考模式的可重复跳动

    公开(公告)号:US08670206B1

    公开(公告)日:2014-03-11

    申请号:US13431691

    申请日:2012-03-27

    IPC分类号: G11B5/596

    CPC分类号: G11B5/59627

    摘要: A disk drive is disclosed comprising head actuated over a disk comprising a reference pattern. The head is positioned at a first radial location, a first phase error is measured in response to the reference pattern at the first radial location, and a first repeatable runout (RRO) of the first phase error is measured. The head is positioned at a second radial location, a second phase error is measured in response to the reference pattern at the second radial location, and a second repeatable runout (RRO) of the second phase error is measured. The first and second RROs are processed to estimate an offset r0 representing a difference between an axial rotation of the disk and an axial rotation of the reference pattern.

    摘要翻译: 公开了一种磁盘驱动器,其包括在包括参考图案的盘上致动的磁头。 头部位于第一径向位置处,响应于第一径向位置处的参考图案测量第一相位误差,并且测量第一相位误差的第一可重复跳动(RRO)。 头部位于第二径向位置处,响应于第二径向位置处的参考图案测量第二相位误差,并且测量第二相位误差的第二可重复跳动(RRO)。 处理第一和第二RRO以估计表示盘的轴向旋转和参考图案的轴向旋转之间的差异的偏移r​​0。

    Disk drive compensating for track squeeze by writing non-circular servo tracks
    6.
    发明授权
    Disk drive compensating for track squeeze by writing non-circular servo tracks 有权
    磁盘驱动器通过写入非圆形伺服磁道补偿磁道挤压

    公开(公告)号:US08749904B1

    公开(公告)日:2014-06-10

    申请号:US13406778

    申请日:2012-02-28

    IPC分类号: G11B27/36

    摘要: A servo writer is disclosed operable to write servo sectors on a disk to define non-circular servo tracks. The servo writer comprises control circuitry including a servo control system operable to measure a position of a head over the disk to generate a position signal, generate a position error signal (PES) representing a difference between the position signal and a reference signal, process the PES with a servo compensator to generate a control signal, and position the head over the disk in response to the control signal. A disturbance is induced into the servo control system, and while positioning the head over the disk in response to the control signal, a plurality of servo sectors are written on the disk to define a servo track, wherein the disturbance induced into the servo control system causes the servo track to be non-circular relative to a rotation axis of the disk.

    摘要翻译: 公开了一种伺服写入器,其可操作以在盘上写入伺服扇区以限定非圆形伺服轨道。 伺服写入器包括控制电路,其包括伺服控制系统,该伺服控制系统可操作以测量磁头在磁盘上的位置以产生位置信号,生成表示位置信号与参考信号之间的差异的位置误差信号(PES),处理 PES与伺服补偿器产生控制信号,并且响应于控制信号将磁头定位在磁盘上。 扰动被引入到伺服控制系统中,并且响应于控制信号将磁头定位在磁盘上,多个伺服扇区被写在磁盘上以定义伺服磁道,其中引入到伺服控制系统 使得伺服轨道相对于盘的旋转轴线是非圆形的。

    Disk drive servo writing from spiral tracks using radial dependent timing feed-forward compensation
    7.
    发明授权
    Disk drive servo writing from spiral tracks using radial dependent timing feed-forward compensation 有权
    使用径向相关定时前馈补偿从螺旋轨道进行磁盘驱动器伺服写入

    公开(公告)号:US08929021B1

    公开(公告)日:2015-01-06

    申请号:US13431680

    申请日:2012-03-27

    IPC分类号: G11B5/596 G11B27/32

    摘要: A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of spiral tracks, wherein each spiral track comprising a high frequency signal interrupted at a predetermined interval by a sync mark. An offset r0 representing a difference between an axial rotation of the disk and an axial rotation of the spiral tracks is estimated. Radial dependent timing compensation values are generated in response to the estimated r0. A phase error is generated in response to the sync marks in the spiral track crossings. A control signal is generated in response to the phase error and the radial dependent timing compensation values, and a frequency of an oscillator is adjusted in response to the control signal.

    摘要翻译: 公开了一种磁盘驱动器,包括在包括多个螺旋轨道的盘上致动的磁头,其中每个螺旋轨道包括以预定间隔以同步标记中断的高频信号。 估计表示盘的轴向旋转与螺旋轨迹的轴向旋转之间的差异的偏移r​​0。 响应于估计的r0产生径向相关定时补偿值。 响应于螺旋轨道交叉中的同步标记产生相位误差。 响应于相位误差和与径向相关的定时补偿值产生控制信号,并且响应于控制信号调整振荡器的频率。

    Disk drive adjusting demodulation window for spiral track using timing feed-forward compensation
    8.
    发明授权
    Disk drive adjusting demodulation window for spiral track using timing feed-forward compensation 有权
    使用定时前馈补偿的磁盘驱动器调整螺旋轨道的解调窗口

    公开(公告)号:US08724253B1

    公开(公告)日:2014-05-13

    申请号:US13431655

    申请日:2012-03-27

    IPC分类号: G11B5/596

    CPC分类号: G11B5/59661 G11B5/59627

    摘要: A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of spiral tracks, each spiral track comprising a high frequency signal interrupted at a predetermined interval by a sync mark. The head is used to read the spiral tracks to generate a read signal representing spiral track crossings. A position error signal (PES) is generated in response to the spiral track crossings, and the head is servoed over the disk in response to the PES. Timing feed-forward compensation values are generated in response to the PES, and the timing feed-forward compensation values are used to open a demodulation window at each spiral track crossing, wherein the timing feed-forward compensation values compensate for a repeatable runout (RRO) of the spiral tracks.

    摘要翻译: 公开了一种磁盘驱动器,包括在包括多个螺旋轨道的盘上致动的磁头,每个螺旋磁道包括以预定间隔以同步标记中断的高频信号。 头部用于读取螺旋轨道以产生表示螺旋轨迹交叉的读取信号。 响应于螺旋轨迹交叉而产生位置误差信号(PES),并且响应于PES,磁头被伺服在磁盘上。 响应于PES产生定时前馈补偿值,并且使用定时前馈补偿值在每个螺旋轨迹交叉处打开解调窗口,其中定时前馈补偿值补偿可重复的跳动(RRO )的螺旋轨道。

    Edge detection for disk drives
    9.
    发明授权
    Edge detection for disk drives 有权
    磁盘驱动器的边缘检测

    公开(公告)号:US08687312B1

    公开(公告)日:2014-04-01

    申请号:US12957152

    申请日:2010-11-30

    申请人: Jiangang Liang

    发明人: Jiangang Liang

    IPC分类号: G11B21/02 G11B27/36

    摘要: A process is disclosed for determining one or more edges of usable portions of a disk drive. Such knowledge can be used to determine the range of valid tracks of the disk and improve utilization of available disk space. The process can detect the edges by processing one or more disk controller signals, such as an adaptive feed-forward (AFC) injection signal, or a position error signal (PES).

    摘要翻译: 公开了一种用于确定磁盘驱动器的可用部分的一个或多个边缘的过程。 这些知识可用于确定磁盘的有效磁道的范围,并提高可用磁盘空间的利用率。 该过程可以通过处理一个或多个盘控制器信号(例如自适应前馈(AFC)注入信号)或位置误差信号(PES))来检测边缘。

    Disk drive selecting a global digital-to-analog setting for a plurality of heads
    10.
    发明授权
    Disk drive selecting a global digital-to-analog setting for a plurality of heads 有权
    磁盘驱动器为多个磁头选择全局数模转换设置

    公开(公告)号:US08780473B1

    公开(公告)日:2014-07-15

    申请号:US12608871

    申请日:2009-10-29

    IPC分类号: G11B5/09

    摘要: A method is disclosed for selecting a global digital-to-analog setting for a plurality of heads in a disk drive, the disk drive comprising a plurality of disk surfaces and a plurality of respective heads. The method comprises: adjusting a first digital-to-analog setting for a first head to generate a first signal, adjusting a second digital-to-analog setting for a second head to generate a second signal, selecting a first scalar setting for scaling the first signal, selecting a second scalar setting for scaling the second signal, and selecting the global digital-to-analog setting in response to the adjusted first digital-to-analog setting, the adjusted second digital-to-analog setting, the first scalar setting, and the second scalar setting.

    摘要翻译: 公开了一种用于为盘驱动器中的多个头选择全局数模转换设置的方法,该盘驱动器包括多个盘表面和多个相应的头。 该方法包括:调整用于第一头的第一数字 - 模拟设置以产生第一信号,调整用于第二头的第二数字 - 模拟设置以产生第二信号,选择第一标量设置以缩放 第一信号,选择用于缩放第二信号的第二标量设置,以及响应于调整的第一数模转换设置,调整的第二数模转换设置,第一标量选择全局数模转换设置 设置和第二个标量设置。