Magnetic head slider

A magnetic head slider comprising:

• a surface having a front end, a rear end, and two side edges, said surface having a full length between the front end and the rear end, said surface for facing to a magnetic disk with a predetermined pitch angle,
• a first rail having a first air bearing surface, the first rail being disposed on said surface along one of said side edges and extending from said front end of said surface toward said rear end of said surface,
• a second rail having a second air bearing surface, the second rail being disposed on said surface along a remaining one of said two side edges and extending from said front end toward said rear end,
• wherein each of the first and second rails extend over a length less than the full length;
• and
• a third rail having a third air bearing surface, the third rail being disposed on said surface between said first rail and said second rail, said third air bearing surface being disposed between a first air pressurization part and a second air pressurization part,
• wherein said first air pressurization part and said second air pressurization part are sunk by a same depth from said third air bearing surface, and a width of said first air pressurization part is larger than a width of said second pressurization part.