Patent ID: 6974368

Claim:
A method of producing a magnetic hard disk substrate, said method comprising the steps of: rotating in a specified direction a substrate selected from the group consisting of aluminum substrates and glass substrates, said substrate having a surface; supplying polishing slurry on said surface; and pressing a polishing tape on said surface and running said polishing tape in a direction opposite to said specified direction of rotation of said substrate; wherein said polishing slurry comprises: abrading particles with diameters in the range of 1-50 nm, selected from the group consisting of monocrystalline diamond particles, polycrystalline diamond particles and cluster particles comprising monocrystalline and polycrystalline diamond particles; and a dispersant for said abrading particles selected from the group consisting of water and water-based aqueous solutions; wherein texturing marks with a line density greater than 70 lines/μm in a radial direction are formed on said surface.