Neil F Heiman

US Patent:

56352697, Jun 3, 1997

Filed:

Jan 19, 1995

Appl. No.:

8/375246

Inventors:

Richard D. Weir - Agoura Hills CA
Carl W. Nelson - Hayward CA
Neil D. Heiman - Morgan Hill CA

Assignee:

Tulip Memory Systems, Inc. - Fremont CA

International Classification:

G11B 566

US Classification:

428 653

Abstract:

A magnetic-recording disk comprising a metal substrate disk having a textured annular first surface area with an outer diameter which is substantially less than the diameter of the metal substrate is disclosed herein. The metal substrate disk further has a smooth annular second surface area between the first surface area's outer diameter and the metal substrate's circumferential edge. The textured annular first surface area has a laser-etched circular pattern. Furthermore the metal disk substrate of an aluminum alloy, a titanium alloy, or an austenitic stainless steel has a thin-film coating selected from the group consisting of nitrides, carbides, or borides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum or tungsten.