Patent ID: 8339725

Claim:
A magnetic head slider configured to fly above a rotating magnetic disc, and configured to write and read data, the magnetic head slider comprising: a recording and reproducing element configured to write and read said data; a heat generating element arranged in one side in a width direction of said magnetic head slider with respect to said recording and reproducing element, and configured to generate heat on the basis of an application of current; and a member interposed at least between said recording and reproducing element and said heat generating element, and configured to expand in correspondence to the heat generation of said heat generating element, and said recording and reproducing element is configured to move in a width direction of said magnetic head slider on the basis of said expansion, wherein a flying surface opposed to said magnetic disc includes a plurality of surfaces having different depths from each other, and including at least a step bearing surface, a shallow groove surface and a deep groove surface, and a position at a time of projecting said heat generating element to said flying surface is included in a surface which is equal to or deeper than said shallow groove surface and is shallower than said deep groove surface.