a magnetic disk storage device has a magnetic disk with a storing / reproduction region formed thereon and a head slider facing the disk surface with a plurality of parallel projections to generate an air bearing . magnetic heads each having a head gap are provided in the projections and have an interval between head gaps of at least 1 / n of the width of the whole storing / reproduction region of the disk where n is the number of heads . the device makes it feasible to increase the number of heads per disk and to shorten the seek distance without increasing the weight of the head actuator .