Compensation of Dominant Frequency Component of Non-Repeatable Runout in Hard Disk Drives

This paper presents an approach to compensating for the dominant frequency component of non-repeatable runout (NRRO). Frequency of the dominant component is estimated by the least mean square (LMS) algorithm within a short time window. Based on the frequency estimate, the basis function algorithm is applied to adaptively identify the magnitude and phase of the dominant component. The performance of this compensation scheme is demonstrated by simulation on a realistic hard disk drive model.