Abstract: An arrangement for preventing a condensation on a head for writing information into a storage medium and for reading the information from the storage medium. The arrangement includes a temperature detector for detecting the temperature of the head and a condensation detector for detecting condensation on the head, the temperature detector and the condensation detector being provided in the vicinity of the head, and a heater for heating the head. A controller causes the heater to be energized on the basis of the outputs from the temperature detector and the condensation detector if the head is below a predetermined temperature or if condensation exists on the head at temperatures above the said predetermined temperature.

Abstract: A soft-film-bias type magnetoresistive device is disclosed in which a high-permeability magnetic film, an insulating film and a permalloy film are formed on a substrate in this order, and first, second and third electrodes, which are parallel to each other, are provided on the permalloy film, to form a differential type magnetoresistive device. In this magnetoresistive device, a bias magnetic field which is generated and applied to the permalloy film between the first and second electrodes, is opposite in direction to a bias magnetic field which is generated and applied to the permalloy film between the second and third electrodes.