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    • 2. 发明授权
    • Disk drive evaluating burst metric
    • 磁盘驱动器评估突发度量
    • US08970980B1
    • 2015-03-03
    • US13169938
    • 2011-06-27
    • Abhishek DhandaWei GuoRuss A. QuisenberryGuoxiao GuoJie Yu
    • Abhishek DhandaWei GuoRuss A. QuisenberryGuoxiao GuoJie Yu
    • G11B21/02G11B5/596
    • G11B5/59688G11B5/59655
    • A disk drive is disclosed comprising a disk and a head actuated over the disk. A burst metric is generated in response to a burst read signal. The burst metric comprises at least one of an alpha metric comprising a ratio of a first burst amplitude of a first phased based servo burst measured at a first radial offset to a second burst amplitude of a second phased based servo burst measured at a second radial offset, a harmonic metric comprising a ratio of a first harmonic of the burst read signal as the head is moved radially over the disk to a higher harmonic of the burst read signal as the head is moved radially over the disk, and a spiral track crossing metric comprising a first and second interval each representing a partial duration of the read element crossing a spiral track.
    • 公开了一种磁盘驱动器,其包括盘和在盘上致动的磁头。 响应于突发读取信号产生突发度量。 突发度量包括以下中的至少一个:α度量,其包括在第一径向偏移处测量的第一基于相位的猝发脉冲的第一脉冲串幅度与在第二径向偏移量测量的基于第二相位的伺服脉冲串的第二脉冲串幅度的比率 当磁头径向移动到磁盘上时,当磁头在磁盘上径向移动到脉冲串读取信号的高次谐波时,包括突发读取信号的第一谐波的比率的谐波度量,以及螺旋轨迹交叉度量 包括第一和第二间隔,每个间隔代表穿过螺旋轨道的读取元件的部分持续时间。
    • 3. 发明授权
    • Disk drive adjusting servo timing to compensate for transient when crossing a servo zone boundary
    • 磁盘驱动器调整伺服定时,以补偿穿过伺服区域边界时的瞬态
    • US08780477B1
    • 2014-07-15
    • US13529904
    • 2012-06-21
    • Wei GuoMichael ChangGuoxiao GuoJie Yu
    • Wei GuoMichael ChangGuoxiao GuoJie Yu
    • G11B5/09
    • G11B5/59616G11B5/5547G11B20/10222
    • A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of servo tracks, wherein the servo tracks form a plurality of servo zones, and a servo data rate of servo sectors in a first servo zone is different than a servo data rate of servo sectors in a second servo zone. A disk locked clock is synchronized to the data rate of the servo sectors in the first servo zone, wherein the disk locked clock for generating a timing window relative to the servo sectors. When the head crosses from the first servo zone to the second servo zone, at least one of the disk locked clock and the timing window is adjusted to compensate for a timing transient.
    • 公开了一种磁盘驱动器,其包括在包括多个伺服扇区的磁盘上启动的磁头,所述多个伺服扇区限定多个伺服磁道,其中所述伺服磁道形成多个伺服区,并且第一伺服区中的伺服扇区的伺服数据速率为 与第二伺服区域中的伺服扇区的伺服数据速率不同。 磁盘锁定时钟与第一伺服区域中的伺服扇区的数据速率同步,其中盘锁定时钟用于相对于伺服扇区产生定时窗口。 当头从第一伺服区跨越到第二伺服区时,调整盘锁定时钟和定时窗中的至少一个以补偿定时瞬变。
    • 4. 发明授权
    • Disk drive servo writing from spiral tracks using radial dependent timing feed-forward compensation
    • 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
    • US08929021B1
    • 2015-01-06
    • US13431680
    • 2012-03-27
    • Jiangang LiangWei Guo
    • Jiangang LiangWei Guo
    • G11B5/596G11B27/32
    • G11B20/14G11B20/10222G11B27/32
    • 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.
    • 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。