Patent ID: 6078458
Filing Date: 2000-06-20
Classification: G11B

Abstract:
A system for writing servo fields to a disc of a head disc assembly, the head disc assembly having a head and a spindle motor for rotating the disc, the system comprising:(a) a control circuit, operably connected to the spindle motor, which controls the rotational speed of the spindle motor;(b) an electro-mechanical transducer, operably connected to the head which outputs a signal indicative of vibratory response of the head prior to writing servo data to the disc; and(c) a computer, operably connected to the control circuit and the transducer, which:(i) instructs the control circuit to rotate the spindle motor at each of a plurality of rotational speeds while characterizing the vibratory response at each of the rotational speeds;(ii) identifies an optimal rotational speed therefrom for the writing of the servo fields; and(iii) controls the head disc assembly to write the servo fields at the optimal rotational speed.