A Reference Disk for Head and Tester Qualification
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Feb-02
A mound of predictable height and diameter is grown on the surface of a memory disk substrate. The mound is grown from within the aluminum material of the substrate as a result of relieving localized residual stress during the normal curing operation for the disk coating. The growth of the substrate mound causes the disk coating over the mound to be pushed away from the substrate, thus creating a mound on the surface of the coated disk. The height of the mound can be varied by changing the force and/or the instrument used to create the stress in the substrate material. The stress required to create the substrate mound is caused by pressing an instrument of specific size, shape and hardness into the surface of the substrate with a precisely regulated force.