Flying heads with sub-micron spacing for magnetic recording discs

Abstract This paper describes the analysis, design and development of flying heads for magnetic recording discs. In analysis the characterisctics of flying heads operating at sub-micron spacing, molecular mean free path (mmfp) effects must be taken into account. By applying the numerical calculation procedures to a modified Reynolds equation which considers slip-flow effects, the characteristics of air bearing load carrying capacity, stiffness and damping are clarified. In practical use of contact-start-stop type flying heads, the take-off characteristics have to be considered. The relations between the take-off speed and disc runout are discussed. These developments have enabled the production of flying heads with 0.2 μm and 0.36 μm spacings.