In a magnetic head slider of a magnetic disk apparatus, including therein a load/unload mechanism for loading/unloading the magnetic head slider 2 to the magnetic disk, on which is defined a load/unload zone 12 of a predetermined length in a peripheral direction thereof, wherein a specific command or pattern 14 is recorded in front of the load/unload zone of the magnetic disk, in the peripheral direction thereof, and a controller moves the magnetic head slider onto a track in an inside thereof, so as to avoid passing on or above the load/unload zone, when reading out this specific command recorded, and then moves it back onto that track, again, during when reading/writing data on the track lying on the same radius to that of the load/unload zone.