Glide head with low sensitivity

A glide head for burnishing or smoothing the surface of a magnetic disk has an air bearing on one side and a piezoelectric element on an opposite side. The air bearing comprises a patterned set of four or five air bearing surfaces (ABS) and etched pockets having multiple depths in the air bearing. The air bearing preferably has two front ABS, two middle ABS, and one rear ABS. This configuration gives the air bearing superior performance characteristics over prior art designs. When the glide head contacts a defect or asperity on the surface of the disk, the glide head vibrates and causes the piezoelectric element to become excited and emit a signal in response.