Abstract: A storage device includes a storage medium and a plurality of probes. The probes each have a recording/reproducing portion. The probes include a first probe, a second probe spaced from the first probe in a first direction, and a third probe spaced from the first probe in the first direction and in a second direction different from the first direction. A distance Xp1 in the first direction between the portions of the first and second probes, a distance Xp2 in the first direction between the portions of the first and third probes, and a distance Yp2 in the second direction between the portions of the first and third probes satisfy the following formulae: Xp1=n×Xm Xp1=Xm Yp2=Ym/n??[Math 1] (, provided that n=2, 3, 4, - - - ), where Xm and Ym are lengths of each area in the first and second directions, respectively.