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    • 56. 发明授权
    • Disk drive with phase-quadrature servo pattern and demodulated position error signal insensitive to timing and phase-misalignment errors
    • 具有相位正交伺服模式的磁盘驱动器和解调位置误差信号对定时和相位错位误差不敏感
    • US07209314B2
    • 2007-04-24
    • US11148752
    • 2005-06-09
    • Zvonimir Z. BandicMichael A. Moser
    • Zvonimir Z. BandicMichael A. Moser
    • G11B5/596
    • G11B5/59688
    • A magnetic recording disk drive uses a phase-quadrature position-error-signal (PES) pattern and a servo signal demodulator that is insensitive to clock errors and phase-misalignment errors. The disk has angularly-spaced servo sectors, with each servo sector having radially-spaced servo tracks that contain a phase-quadrature pattern of servo blocks. A first band in each servo sector contains two generally like patterns radially-spaced in the servo track with the second pattern phase-shifted 90 degrees along-the-track from the first pattern. A second band in each servo sector is spaced along-the-track from the first band and also has two patterns like those in the first band, but with the phase shift of the second pattern being in the opposite direction to the phase shift of the second pattern in the first band. The demodulator calculates the true amplitudes of the servo signal from the measured amplitudes of the servo signals from each band to thereby remove clock errors and phase-misalignment errors.
    • 磁记录盘驱动器使用对时钟误差和相位错位误差不敏感的相位正交位置误差信号(PES)模式和伺服信号解调器。 磁盘具有角度间隔的伺服扇区,每个伺服扇区具有包含伺服块的相位正交模式的径向间隔的伺服磁道。 每个伺服扇区中的第一频带包含在伺服轨道中径向间隔的两个大致相似的模式,其中第二模式与第一模式沿着轨迹相移90度。 每个伺服扇区中的第二频带与第一频带沿着轨道间隔开,并且还具有与第一频带中的那些相似的两个模式,但是第二模式的相移与相位偏移相反 第一个乐队的第二个模式。 解调器根据来自每个频带的伺服信号的测量幅度计算伺服信号的真实振幅,从而消除时钟误差和相位误差。
    • 60. 发明授权
    • Disk drive with variable incremented counting of writes to the data tracks for minimizing the effect of far track erasure
    • 磁盘驱动器具有对数据磁道写入的可变递增计数,以最小化远磁道擦除的影响
    • US08531793B2
    • 2013-09-10
    • US12839391
    • 2010-07-19
    • Zvonimir Z. BandicMarco SanvidoBruce Alexander Wilson
    • Zvonimir Z. BandicMarco SanvidoBruce Alexander Wilson
    • G11B20/18
    • G11B5/09G11B20/1816G11B2220/2516
    • A hard disk drive (HDD) minimizes the effects of far track erasure (FTE) by counting the number of writes to the data tracks and incrementing counters based on the known effect of FTE on each track. The extent of the FTE effect is determined for each track within a range of tracks of the track being written, and based on the relative FTE effect for all the tracks in the range a count increment (CI) is determined for each track within the range. A counter is maintained for each track. For every writing to a track, a count for each track within a range of the track being written is increased by the CI value associated with the track number within the range. When the count value for a track reaches a predetermined threshold the data is read from that track and rewritten, preferably to the same track.
    • 硬盘驱动器(HDD)通过根据每个轨道上已知的FTE效应计数对数据磁道的写入次数和递增计数器,从而最大限度地减少了远跟踪擦除(FTE)的影响。 针对正在写入的磁道的磁道的范围内的每个磁道确定FTE效应的范围,并且基于对该范围内的所有磁道的相对FTE效应,对该范围内的每个磁道确定计数增量(CI) 。 为每个轨道维护计数器。 对于对轨道的每次写入,在被写入的轨道的范围内的每个轨道的计数增加与该范围内的轨道号相关联的CI值。 当轨道的计数值达到预定阈值时,从该磁道读取数据并将其重写,优选地改写为相同的轨道。