Magnetic disk apparatus and servo signal recording method

A magnetic head apparatus comprising:

• 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;
• wherein;
• the stopper is formed by an elastic member;
• an elastic deformation amount of the stopper is changed by changing force of driving the actuator under such a condition that the actuator is depressed against the stopper in order that the position of said head is adjusted, and a positional dependent characteristic along a radial direction of the magnetic disk as to a reproduction output of the head is measured;
• and
• a relationship between a magnitude of drive force capable of depressing the actuator against the stopper and a position of the head along a width direction thereof is defined by that a variation of gradients is limited to 10% within a range of two tracks of the magnetic disk.