Reduction in high frequency disturbance in hard disk drives using adaptive feed-forward control

Abstract

Currently, HDDs are mainly used as storage devices in data center servers. However, it is known that the vibration caused by the sound pressure of the HDD cooling fan in the server increases the positioning error of the head and reduces the read/write speed. In a previous study, adaptive control was used to reduce the vibration, but it was found to be difficult to reduce the vibration when the disturbance frequency changed. In this study, the modal parameters of the filter in the first stage of the adaptive control in the previous study were changed as needed to design a control with a high reduction effect