Compensation and identification for external disturbances in head positioning systems of hard disk drives based on a data-based design method

This paper introduces a compensation and identification method for external disturbances in head positioning systems of hard disk drives (HDDs). For increasing a data capacity of HDDs, head positioning control system must compensate for any disturbance which worsen positioning accuracy. However, the traditional model-based controller design method mayn't design a controller for the disturbances compensation. Because, it is difficult to create a mathematical model of the external disturbances. The proposed method can design the controllers without the mathematical model. Moreover, it can identify the characteristics of external disturbances simultaneously. It's effectiveness has been verified by experiments in the head positioning control.