Precision-etched textured stop/start zone for magnetic-recording disks
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United States of America Patent
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Jun 3, 1997
Issued Date -
N/A
app pub date -
Jan 19, 1995
filing date -
Apr 15, 1992
priority date (Note) -
Expired
status (Latency Note)
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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.
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