Abstract
For down-sizing and increasing capacity of disk file memories, a servo technology for micron trackwidth is one of the most important themes to realize high recording density. Three key problems for micron trackwidth servo are investigated. They are a high SNR of position error signal, a gain variation caused by head/pattern width variation, and a dual-stage actuating. It is shown that over 12dB of SNR(electrical) is necessary for tracking around 1μm trackwidth head. And a new dual-stage servo system is proposed for a high performance tracking technology.
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