JPS6473581A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the adhesion accident of a head by forming electrode at the slider itself or the lower surface of the slider for a recording medium and forming a insulating thin film on the surface of the electrode or the surface of the recording medium. CONSTITUTION:The change of electrostatic capacity by water or lubricating oil existing in the gap between head disks are measured. That means, the disk uses a conductive continuous medium and a conductive head or a head having a conductive thin film 2 to measure the electrostatic capacity between the head and disks. Then, by measuring the variation of the electrostatic capacity between them, the very small amount of the water or the oil existing in the very small gap is perceived. As the electrostatic capacity does not exist when the both electrode directly contact each other, the liquid between a insulating film 3 and the other electrode is detected by arranging the both electrode to contact each other through the thin insulating film 3. Thus, as the adhesive force between the head and a spatter medium 5 can be foreknown at stopping time, the damage of a head supporting body 4, etc., can be prevented.