The Strategy of Designing Seek Current Profile to Reduce Acoustic Noise and Residual Vibrations

The acoustic noise level of hard disk drive (HDD) is becoming more important for HDD in home entertainment applications. The residual vibration is a significant factor not only to the acoustic problem but also to the performance of HDD. In this work, a pseudo sinusoidal wave is used to design a smooth current profile to reduce acoustic noise. With consideration of current saturation limit and the maximum seeking velocity limit, a systematic method is proposed to design parameters such as the period of sinusoidal wave, the saturation time and the coasting time such that the residual vibrations are significantly reduced.