Patent ID: 6013336
Filing Date: 2000-01-11
Classification: B23K,G11B

Abstract:
A process for manufacturing a magnetic data storage disk having an outer surface with a nominal surface plane suitable for use with a magnetic head for reading and writing magnetically-readable data on said outer surface, said process comprising the steps of:(a) forming on a substrate a substantially planar specular substrate surface;(b) depositing a substantially magnetizable film over said planar specular substrate surface to form a layer having a recording surface; and(c) concentrating radiant energy selectively upon a plurality of spaced-apart locations over a treatment region on a selected one of said recording surface and said planar specular substrate surface to produce an asperity which comprises a dome-shaped protrusion at each said spaced-apart location, wherein said space-apart locations have a minimum separation distance D.sub.s that is substantially greater than the largest diametral dimension D.sub.r of said asperity at said each spaced-apart location.