Calibration disk having discrete bands of calibration bumps

摘要: A calibration disk for calibrating the fly height of a head, includes spaced circumferencial bands on extending in concentric fashion from adjacent an outer diameter to near inner disk. Each include radial and asperity emulating bumps having population sufficient produce constant continuous output signal glide head when flies lower than maximum bumps. The within individual are substantially uniform, average heights each band differ other. configuration advantageously avoids errors caused by waviness, runout, contamination. Further, using differing disk, can be calibrated tester without independent measurements head. Thus, measurement delay mounting avoided.