DEFECT INSPECTION METHOD OF PERPENDICULAR MAGNETIC RECORDING MEDIUM, MAGNETIC DISK APPARATUS, DEFECT REGISTRATION METHOD IN MAGNETIC DISK APPARATUS MOUNTING PERPENDICULAR MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To solve such a troublesome problem that a low signal stability part due to magnetic defect is hard to detect previously on a property of a perpendicular magnetic recording medium, and after a medium is incorporated in a magnetic disk apparatus and after shipping, a defect is detected.;SOLUTION: In a manufacturing process of the perpendicular magnetic recording medium, after a magnetic film forming process S14 and a lubricant applying process S16, a DC erase-processing S18 DC-degaussing a medium is performed. Thereby, influence due to an inverse magnetic field is maximized, instability of a direction of magnetization is increased intentionally. After that, magnetization inversion in a potential defect part is promoted by performing heating processing S20 for the medium. Defects can be detected efficiently by performing defect examination S22 detecting magnetization inversion part based on variation of a base line of a signal read out from the medium in this state.;COPYRIGHT: (C)2006,JPO&NCIPI