Abstract: A calibration disk includes calibration areas that allow a glide head to be calibrated as to the glide's head's avalanche height, fly height and the like. The calibration areas may be, for example, configured in a circumferential band (or, alternatively, a series of circumferential bands extending substantially concentric to one another), one or more spiral bands or some other suitable configuration. Such bands can, for example, extend from adjacent an outer diameter of the calibration disk to adjacent an inner portion of the calibration disk. Each of the circumferential bands is a textured area on the calibration disk having a given degree of composite roughness, as measured by the given circumferential band's average composite roughness height, and as such is referred to herein as a calibration band.