Magnetic disk apparatus having an adjustable mechanism to compensate write or heat element for off-tracking position with yaw angle

A magnetic disk apparatus comprising:

• a disk holding data as magnetic information on a magnetic recording film;
• a head to perform writing and reading of the magnetic information;
• a rotary actuator to move the head in a radial direction of the disk;
• a heat element in the head to locally heat the disk;
• plural write elements in the head to apply a magnetic field to the disk;
• and
• means for selecting one write element from the plural write elements, wherein the means for selecting the write element selects at least one write element from the plural write elements so as to bring a center line of an area heated by the heat element and a center line of the position of the magnetic field generated by the write element into approximate correspondence, in correspondence with a relative angle between the head and a direction of movement of the disk.

A magnetic disk apparatus comprising:

• a disk holding data as magnetic information on a magnetic recording film;
• a head to perform writing and reading of the magnetic information;
• a rotary actuator to move the head in a radial direction of the disk;
• a heat element in the head to locally heat the disk;
• a write element in the head to apply a magnetic field to the disk;
• and
• means for heating an area as a part of the heat element, wherein the means for heating the area of the heat element changes a position of the area of the heat element so as to bring a center line of an area heated by the heat element and a center line of the position of the magnetic field generated by the write element into approximate correspondence, in correspondence with a relative angle between the head and a direction of the disk.