Pre-Filtering and Head-Dependent Adaptive Feed-Forward Compensation for Linear Vibration in Hard-Disc-Drive

This paper suggests a pre-filtering and head-dependent adaptive feed-forward (AFF) control scheme for vibration compensation in hard-disc-drive (HDD) servo system. First, an AFF algorithm is designed and implemented for the linear vibration compensation in the servo system. In order to improve the vibration compensation performance significantly, a pre-filtering process is added in the AFF scheme. Meanwhile, a head-dependent AFF control strategy is proposed and implemented to accommodate the dynamics variations in HDD servo system. This head-dependent AFF control scheme improves the vibration compensation performance in consistency. The proposed pre-filtering and head-dependent AFF control scheme is validated by the drive level experiments with significant performance improvement for vibration compensation in high density HDD servo system.