The present invention is directed to a bearing surface on a slider having
a center split pressurization feature which minimizes the effects of
altitude or change in ambient air pressure on the flying characteristics
of the slider. After a cavity dam and a subambient pressurization cavity
is the center split feature. The center split feature is located
proximate the centroid of the slider body and the bearing surface. The
center split feature has, at least, three levels including a first center
split level a second center split level and a third center split level.
The first center split level is at the same level as the bearing surface
level and is located closest to the centroid. The second center split
level is located forward of, in the direction of air flow, the first
center split level. The second center split level is also recessed from
the first center split level to the same level as the first recessed
level. The third center split level is located forward of the second
center split level and is recessed from the second center split level.