MAGNETIC RECORDING MEDIUM, MANUFACTURE OF THE SAME, METHOD OF USING THE SAME, MAGNETIC RECORDING METHOD, AND MAGNETIC RECORDING/REPRODUCING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a magnetic recording medium or the like difficult to falsify and alter. SOLUTION: A magnetic layer existing part 14 and a magnetic layer missing part 16 are formed by radiating a laser light in the almost orthogonal direction to the scanning direction X of a card to cut a magnetic recording layer 6. An unrewritable magnetic barcode 20 is formed by combining the magnetic layer existing part 14 with the magnetic layer defecting part 16 to dispose along the scanning direction X. A boundary face 18 is almost flat face almost orthogonal to the scanning direction X. Then, an almost right-angled edge part E is obtained by a laser work. Thus, an SN ratio when the magnetic barcode 20 is read is extremely high. Thus, the information recording density of the magnetic barcode 20 is improved, and identification information peculiar to the individual magnetic recording medium is recorded. Thus, the falsification and the alteration of the magnetic recording medium are made to be difficult.