Head slider having trailing end configuration of a groove formed at a boundary between a trailing step and a trailing pad for adaptation with a gimbal assembly and disk drive

A magnetic head comprising:

• a head slider comprising a bearing surface opposed to a surface of a recording medium, an inflow end face, and an outflow end face, and configured to fly by an airflow between the recording medium surface and the bearing surface;
• and
• a recording element and a reproduction element disposed in an outflow end portion of the head slider with respect to the airflow,
• the bearing surface of the head slider comprising a trailing step on the outflow end portion, a trailing pad on the trailing step wherein the trailing pad has a bearing surface located at a different elevation than bearing surface of the trailing step and comprising an outflow end kept at an inflow-side gap away from the outflow end face, and a first groove being 5 μm wide or less but greater than zero μm and formed along a step portion at a boundary between the trailing step and the trailing pad.