following control of hard disk drive by characteristic ratio assignment method. The study in this paper concerns design of a PID controller which sufficiently robust to the disturbances and plant perturbations on following control of hard disk drive. Characteristic Ratio Assignment (CRA) is shown to be an efficient control technique to serve this requirement. The controller design by CRA is based on the choice of the coefficients of the characteristic polynomial of the closed loop system according to the convenient performance criteria such as equivalent time constant and ration of characteristic coefficient. Hence, in this study, CRA method is applied in PID controller design for following control of hard disk drive. Matlab simulation results shown that CRA design is fairly stable and robust whilst giving the convenience in controller’s parameters adjustment. This paper proposes PID controller design for following control of hard disk drive by characteristic ratio assignment method which satisfies specification of performance of control system and has capability on robustness to disturbances and plant perturbations. Furthermore, it is very convenient in controller’s parameters adjustment. The paper introduces summary details of hard disk drive servo system in section II. Section III gives the CRA design procedure. PID Controller design for the track following control of hard disk drive is explained in section IV. Section V describes the experimental simulations by Matlab program and theirs obtained results. Finally, conclusions are given i
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