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    • 24. 发明授权
    • Disk drive recursively estimating repeatable runout
    • 磁盘驱动器递归地估计可重复的跳动
    • US07088547B1
    • 2006-08-08
    • US11188914
    • 2005-07-25
    • Zhi WangJenghung Chen
    • Zhi WangJenghung Chen
    • G11B5/596
    • G11B5/59627
    • A disk drive is disclosed comprising control circuitry for generating a control signal applied to a VCM in response to a position error signal (PES) generated from reading embedded servo sectors and a feed-forward compensation value that compensates for a repeatable runout (RRO) disturbance. The feed-forward compensation value is generated for each servo sector in response to an RRO estimate Ŝ computed recursively for each servo sector according to: S ^ n + 1 = S ^ n - λ ⁡ [ S ^ n - 1 n ⁢ ∑ i = 1 n ⁢ ⁢ PES i ] wherein: λ is a predetermined fraction; PESi is the position error signal generated for a selected servo sector during an ith revolution of the disk; and n represents a number of disk revolutions.
    • 公开了一种磁盘驱动器,其包括用于响应于从读取嵌入式伺服扇区产生的位置误差信号(PES)产生施加到VCM的控制信号的控制电路和补偿可重复跳动(RRO)干扰的前馈补偿值 。 响应于针对每个伺服扇区递归地计算的RRO估计S,针对每个伺服扇区产生前馈补偿值:
    • 25. 发明授权
    • Method for iteratively determining repeatable runout cancellation values in a magnetic disk drive
    • 用于迭代确定磁盘驱动器中的可重复跳动消除值的方法
    • US06999267B1
    • 2006-02-14
    • US10835446
    • 2004-04-28
    • Hemant MelkoteZhi Wang
    • Hemant MelkoteZhi Wang
    • G11B5/596
    • G11B5/59627
    • The present invention may be embodied in a method of determining a repeatable runout (RRO) compensation value set for a data track on a magnetic disk in a disk drive. The track comprises a plurality of embedded sectors that define a circumferential path having RRO requiring compensation during data read and write operation. In the method, track following is performed along the track and a position error signal (PES) is determined for each servo sector. An RRO compensation value is iteratively learned for each servo sector using the previously learned value for the servo sector and using the PES for the servo sector and for adjacent servo sectors.
    • 本发明可以体现在确定对于磁盘驱动器中的磁盘上的数据轨道设置的可重复跳动(RRO)补偿值的方法中。 轨道包括多个嵌入扇区,其限定了在数据读取和写入操作期间需要补偿的RRO的圆周路径。 在该方法中,轨道跟踪是沿轨道执行的,并且为每个伺服扇区确定位置误差信号(PES)。 对于每个伺服扇区,使用先前学习的伺服扇区的值并且使用用于伺服扇区的PES和相邻的伺服扇区来迭代地学习RRO补偿值。
    • 29. 发明授权
    • Disk drive servo control techniques to preserve PES continuity
    • 磁盘驱动伺服控制技术,保持PES连续性
    • US07616399B1
    • 2009-11-10
    • US11635904
    • 2006-12-07
    • Min ChenZhi WangDuc T. Phan
    • Min ChenZhi WangDuc T. Phan
    • G11B5/596
    • G11B5/59627
    • A disk drive comprising a moveable head, a disk, and a servo controller that implements servo control techniques to preserve PES continuity during track following operations is disclosed. The disk includes a plurality of tracks in which a substantial majority of the tracks include a plurality of servo sectors having a plurality of servo bursts that are utilized in track following operations. The servo controller controls track following operations with the moveable head and implements operations to preserve PES continuity during track following. These operations include: dividing tracks of the disk into a plurality of zones wherein each zone includes zone boundaries; and utilizing a PES equation for each zone to generate a PES value based upon read servo bursts wherein each zone PES equation includes a normalizing factor to account for boundary conditions associated with zone boundaries to preserve PES value continuity between zones.
    • 公开了一种磁盘驱动器,其包括可移动磁头,磁盘和伺服控制器,其实现伺服控制技术以在跟踪操作期间保持PES连续性。 磁盘包括多个磁道,其中绝大多数磁道包括具有多个伺服脉冲串的多个伺服扇区,这些伺服扇区在跟踪操作中被使用。 伺服控制器通过可移动头控制跟踪跟踪操作,并实现跟踪跟踪期间保持PES连续性的操作。 这些操作包括:将盘的轨迹分成多个区,其中每个区包括区域边界; 并且利用每个区域的PES等式基于读取的伺服脉冲串生成PES值,其中每个区域PES方程式包括归一化因子以考虑与区域边界相关联的边界条件以保持区域之间的PES值连续性。
    • 30. 发明授权
    • Disk drive to characterize misaligned servo wedges
    • 磁盘驱动器来表征不对准的伺服楔
    • US07551390B1
    • 2009-06-23
    • US11842315
    • 2007-08-21
    • Zhi WangJenghung Chen
    • Zhi WangJenghung Chen
    • G11B5/596G11B5/09
    • G11B5/59611G11B19/045G11B20/10009G11B20/10222G11B20/1403G11B20/18G11B2020/1282G11B2220/2516
    • Disclosed is a disk drive and method to characterize misaligned servo wedges. The disk drive includes an actuator arm, a head, a disk, and a servo controller. The head is connected to a distal end of the actuator arm in which the actuator arm is rotatable about a pivot to move the head radially over the disk. The servo controller is used to characterize misaligned servo wedges by implementing operations including: commanding the head to track follow on a track; measuring wedge-to-wedge time (WTWT) values corresponding to time intervals between identified servo wedges; calculating wedge-to-wedge time (WTWT) variations for the measured WTWT values; and characterizing the calculated WTWT variations, wherein, characterizing the calculated WTWT variations for the track includes utilizing a WTWT variation modeling function to model the WTWT variations.
    • 公开了一种用于表征不对准伺服楔的磁盘驱动器和方法。 磁盘驱动器包括致动器臂,磁头,磁盘和伺服控制器。 头部连接到致动器臂的远端,致动器臂可绕枢轴旋转,以使头部径向移动到盘上。 伺服控制器用于通过执行操作来表征不对准的伺服楔块,包括:命令头跟踪轨道跟踪; 测量对应于所识别的伺服楔之间的时间间隔的楔到楔时间(WTWT)值; 计算测量WTWT值的楔形到楔形时间(WTWT)变化; 并且表征所计算的WTWT变化,其中,表征所述轨道的所计算的WTWT变化包括利用WTWT变化建模函数来模拟所述WTWT变化。