Method and apparatus for controlling magnetic disk drive

摘要

A method of controlling a magnetic disk drive including: at least one magnetic head including a write element for writing data to a magnetic disk (100) and a magneto-resistive element for reading the data from the magnetic disk; a spindle motor for rotating the magnetic disk; and a rotary type actuator (101) for locating the magnetic head in a desired track position on the magnetic disk, the method comprising: a step of detecting whether or not the spindle motor reaches steady rotation from rotating start; a step of starting a supply of a bias current to the magneto-resistive element according to a detection of the steady rotation; a step of detecting that the write head performs on a data writing and detecting that there is no access to the drive between a predetermined interval during supply of the bias current to the magneto-resistive element; and a step of stopping the supply of a bias current to the magneto-resistive element when detecting that the write head performs on a data writing or that there is no access to the drive between a predetermined interval. <IMAGE>