Slider and Disk Dynamics and Contact Energy During Contact Start Stop in Hard Disk Drive
Details
A measure of head disk interface reliability is a better control of the nature and frequency of head disk contact. Intuitively, one strives to minimize the number and severity of those contacts in order to achieve maximal reliability. One approach to assess the relative goodness of a head/disk interface is by comparing the 'contact energy", determined by the area under the CSS friction profile, of that interface. Another approach is a detailed characterization of the contacts for those interfaces, by time frequency analysis. This paper discusses these approaches and our laboratory findings. Contact Energy will be derived and its relationship to durability, as may be determined from css testing, will be discussed. Characterization of the nature of head/disk contacts, and their possible effects, for different head/disk pairs, will be explored.
