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Disk drive estimating repeatable runout of reference pattern based on repeatable runout of phase error
Disk drive estimating repeatable runout of reference pattern based on repeatable runout of phase error
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机译:磁盘驱动器根据相位误差的可重复跳动来估计参考图案的可重复跳动
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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.
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