Abstract
Surface condition of hard disk was investigated by observing acoustic emission signals obtained from glide head with piezo sensor. The signal involve important information about the surface condition. Glide margins were evaluted from glide avalanche curve that coulld not be devided by conventional instrument like stylus type roughness tester. Change of the surface condition was estimated at several steps of manufactureing process of hard disk. The results were;(1) Glide margin of the substrate just texturized was less than that of completed disk.(2) Heat treatment did not affect the glide margin.(3) Glide margin decreases at sputtering process.(4) Only tape polish and head burnish process increase the glide margin.
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