Head-on-Media Detection With PZT Self-Sensing Actuation in Dual-Stage Hard Disk Drives

摘要

This paper presents a novel method of head-on-media (HOM) detection with Pb-Zr-Ti (PZT) self-sensing actuation. Unlike conventional approaches based on X-ray scanning, the proposed method is able to detect HOM drives automatically prior to spin-up activities. As spin-up retries are avoided, the drives can be preserved for failure analysis or data recovery. The mechanism of HOM detection using self-sensing actuation is discussed by deriving the analytical model of PZT active suspension. The HOM detection methodology is established incorporating enhanced indirect-driven self-sensing actuation circuit. Experiments have been carried out to evaluate the effectiveness and consistency of the proposed method.