Patent ID: 6246543
Filing Date: 2001-06-12
Classification: B23K,C03C,G11B

Abstract:
A magnetic recording disk having an outer surface with a nominal surface plane for storing magnetically-readable data, said disk comprising:a layer of glass substrate material having a substantially planar substrate surface; anda magnetizable film layer deposited over said glass substrate surface having a substantially uniform thickness and substantially planar surface which has a disk recording region and a disk contact start and stop (CSS) region for landing and take-off of a magnetic head;said substrate surface having a substrate CSS region below the disk CSS region;said substrate CSS region having a plurality of regularly-spaced-apart elevations, each said elevation having a diametral dimension D.sub.d in the interval from 1 to 100 micrometers and rising to a maximum height h.sub.d <100 nanometer above said substrate surface; andeach elevation being a smoothly shaped dome and free of surface cracks and material ejection.