Magnetic recording medium, the method of manufacturing the same, and the magnetic storage using the magnetic recording medium

摘要

A magnetic recording medium that does not develop film swelling when exposed to severe conditions has a nonmagnetic substrate having a trench formed in the area within 2 mm from and concentrically with the outer circumference or the inner circumference of the nonmagnetic substrate, or formed outside the data area concentrically with the outer circumference or the inner circumference of the nonmagnetic substrate.