An analysis method for determining the head positioning error of hard disk drives-settling response analysis

A settling response analysis method for hard disk drives has been developed. In this method, the settling response is decomposed into its contributing modes using the Prony method, which is one of the experimental modal analysis methods. These modes are divided into servo modes and mechanical vibration modes based on the damping ratio in order to recompose a servo response and a mechanical vibration response. The impact of mechanical vibrations on settling response is quantified by their 2-norm. Relating to the track misregistration (TMR) budget design, each mechanical vibration mode is evaluated according to its initial amplitude and its decay rate.