Effects of certain design parameters on load/unload performance

Dynamic load/unload (L/UL) has been widely used in portable and removable d rives, and the disk drive industry has started to apply it in desktop and s erver drives. There are many design parameters in L/UL systems. In this pap er, we focus on the effects of the ramp profile; slider burnish, disk RPM, loading velocity, and dimple pre-load on L/UL performance. Our simulation r esults show that the loading process is much smoother at low RPM, slider bu rnish increases the steady flying attitudes and slightly smooths the L/UL p rocess. The loading velocity effects are not significant in a wide velocity range for negative pressure sliders. Properly designed ramps can obviously improve the unloading performance, and specially designed ramp profiles ca n also improve the Loading performance at high velocity loading, A larger d imple preload can suppress the pitch oscillation during loading.