The magnetic disk apparatus includes a magnetic disk for storing thereinto information;
a head equipped with a recording conversion element for writing information into
the magnetic disk and a reproducing conversion element for reading information
from the magnetic disk; an actuator arranged by a suspension for supporting the
head so as to move the head on the magnetic disk, and also a drive apparatus for
driving the suspension; and a stopper for limiting a movable range of the actuator,
whereby a distance between a reproduction element and a recording element is measured
and also a track width of the magnetic disk is measured in order to execute a self-servo
write operation.
