高密度記録のための位置決め技術

概要

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This article overviews head positioning systems for hard disk drives to realize high areal density recording, and describes major issues in the area. Head positioning technology can be divided into three categories: quality of the positioning signal, including servo track writing; reduction of disturbances which cause head off-track, and disturbance suppression capabilities such as high servo bandwidth. The major issues in position signal quality are how to realize linearity and how to write servo signals with appropriate accuracy by using a servo track writer (STW). Push pin STW, non-contact STW, media STW, self STW, and pattern printing STW are compared. In the second category, flow-induced vibration is dominant, and ways of reducing this are suggested. In the third category, several servo controls are described, including phase stabilized control with a single-stage actuator, dual-stage actuator servo, and feedforward compensation to cancel selected disturbances.
2004-03-01