Appeal No. 96-0366
Application No. 07/933,893
The appealed claims also stand rejected under 35 U.S.C.
§ 112, second paragraph.
THE SUBJECT MATTER ON APPEAL
The subject matter on appeal is directed to a hard
magnetic disk having a magnetic film surface with micro
projections. In use, a magnetic head contacts the disk during
starting and stopping, but floats over the disk during a
“read/write” operation. More specifically, an air current
keeps the head floating while the disk rotates, but when the
rotation stops, the head contacts the surface of the disk.
When the rotation of a disk is started or stopped, abrasion of
a slider, used to suspend the head above the disk, occurs.
Such starting and stopping is known as CSS (contact stop
start). One critical parameter, observed by appellants that
affects CSS is the bearing ratio curve of the substrate
surface, and appellants’ claims are limited to a bearing curve
having a bearing ratio of 0.1% to 10% at a depth of 5nm from a
highest peak of the surface micro projections.
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