  This paper presents an application of adaptive control algorithm in order to
reject the external disturbances in dual-stage hard disk drives. For this
purpose, a dual PID controller is first designed without the plant exposure to
external disturbances. Then, an adaptive control approach based on recursive
least squares adaptive (RLS) algorithm was employed to identify and reject
disturbances. The performance of the proposed technique was evaluated for hard
disk track-seeking through simulation experiments. Results show the feasibility
and precise tracking of the designed control system.
