Textured disc substrate and method
AssigneeHMT Technology Corporation
InventorsGa-Lane Chen, Jack Xuan
Life of this patent
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Abstract
A disc substrate having a selected roughness gradient from an inner-diameter region to an outer-diameter region, and a method of producing the texturing on the substrate are disclosed. The method includes simulating the movement of texturing particles produced by rotating a texturing pad against a rotating disc substrate, at selected substrate and pad rotational speeds and directions, and for a selected run time. Simulation conditions which produce an averaged cross-hatch angle of intersecting texture lines that is at least about 2 times greater at the inner-diameter region of the substrate than at the outer-diameter region are selected.
Claims4
A disc substrate for use in forming a magnetic recording medium comprising
- an annular surface having inner, middle, and outer diameter regions, and
- formed on said surface, a gradient textured pattern of grooves in and between the inner and outer diameter regions that is characterized by an averaged cross-hatch angle which is at least about 2 times greater at the inner-diameter region than at the outer-diameter region, where the averaged cross-hatch angle is defined as the average of twice the angle a groove makes with a line extending in a circumferential direction.
Dependencies are inferred from the claim text.