Patent ID: 8059497

Claim:
An information recording and reproducing apparatus for recording information by forming an information pit determined by a magnetic domain on tracks in a magnetic recording disk at an inner circumference, an intermediate circumference and an outer circumference, said information pit being formed by applying a magnetic recording field and heating a certain portion of the track, comprising: means for generating a heated area on the track for recording information by forming an information pit; a magnetic head for applying the magnetic field to the information pit and for sensing the information pit on the track; and a swing arm for holding and positioning the magnetic head and the means for generating a heated area to desired portions on the track; wherein the magnetic head includes a magnetic flux detecting means; wherein a magnetic wall direction of the magnetic domain on the magnetic recording disk is coincident with a longitudinal direction of the magnetic flux detecting means with respect to the intermediate circumference and not coincident with the longitudinal direction of the magnetic flux detecting means at the inner circumference or outer circumference; and wherein an orientation of a non-circular shape of the heated area is coincident with a longitudinal direction of the magnetic flux detecting means with respect to the track according to a radial position on the magnetic recording disk.