A position control system for a magnetic head improves servo tracking characteristics
in a low frequency range without impairing the stability of seek operations. The
position control system is equipped with two integrators: a first integrator 43
and second integrator 45. The gain K3 of the second integrator
45 is set larger than the gain K3 of the first integrator 43.
The first integrator 43 plays the role of offsetting the bias force
acting on the magnetic head while the second integrator 45 plays the role
of improving the servo tracking characteristics in the low frequency range.
