Position error predictions of a hard disk drive undergoing a large seeking motion with shock excitations

Abstract

Abstrac~In this digest, we present a numerical simulation to predict position erron of a hard disk drive undergoing a long seeking-and-settling process while experiencing a shock excitation. The seekingand-settling process consists of four segments: acceleration, coasting, deceleration, and settling. A 2-ms shock excitation is applied to each segment of the seeking-and-settling process respectively to evaluate the severity of the shock excitations to position erron. Simulation results lead to two significant conclusions.First, shock excitations occurring near the end of the seeking-anei-settling process are more detrimental causing larger position erron. Second, the ability to rapidly reduce the position erron relies on performance and properties of fluid-dynamic spindle motors.Index Terms-hard disk drives, position erron, shock excitations, fluid-dynamic spindle, seek-andsettling process.