Abstract: There is disclosed a disk drive provided with a function of suspending a read/write operation in the case where the magnetic field of the magnetic disturbance out of the predetermined range is generated. The disk drive has a head writing data to the disk, a sensor detecting a magnetic field with respect to the disk drive, and an actuator unloading the head from the surface of the disk to a retracting position outside of the disk when the detected magnetic field is out of a predetermined range.