Patent ID: 7518818
Filing Date: 2009-04-14
Classification: G11B

Abstract:
1. A magnetic head slider flying height control method for a magnetic disk drive comprising a magnetic disk; a magnetic head slider which flies low above the magnetic disk to write or read magnetic information thereon; and a flying height adjustment structure provided with a heat source placed near the read/write element of the magnetic head slider to control the flying height of the magnetic head slider, said method comprising: detecting the temperature of the magnetic disk drive; calculating the amount of deformation of the read/write element relative to the magnetic head slider at the detected temperature; calculating the level of electric power which compensates for the amount of deformation calculated; and applying the calculated level of electric power to the flying height adjustment structure; wherein the amount of deformation is the amount of protrusion or the amount of retreat, and wherein provided that the ratio of the change in the amount of protrusion of the read/write element to the change in the detected temperature is i nm/° C. and the ratio of the change in the flying height to the change in the electric power applied to the flying height adjustment structure is I nm/mW, if the temperature rises to T° from start temperature t° C., the electric power applied to the flying height adjustment structure is decreased by i(T−t)/I.