A magnetic disk device having a magnetic disk for recording information, a rotary
mechanism for rotating the magnetic disk, a magnetic head unit for recording information
on the rotating magnetic disk, a slider having mounted thereon the magnetic head
unit and flying over the rotating magnetic disk, a magnetic head supporting mechanism
for supporting the slider, and a positioning mechanism for setting the magnetic
head unit at a predetermined radial position. The magnetic head supporting mechanism
has mounted thereon an integrated circuit (IC) for amplifying an information write/read
signal of the magnetic head unit, and a control circuit is connected to the IC.
A recording frequency is controlled according to the radial position of the IC
on the magnetic disk by the control circuit.
