Patent ID: 6991521

Claim:
A method for manufacturing a disk substrate for a rotating disk drive data storage device, comprising the steps of: providing a disk substrate having a circumferential edge, said disk substrate being of a material from the set of materials consisting of: glass, ceramic, and a combination of glass and ceramic; loading said disk substrate to an edge finishing apparatus, said edge finishing apparatus comprising a rotatable grinding appliance having a circumferential edge, said rotatable grinding appliance being rotatable about a first axis, said edge finishing apparatus further comprising a rotatable bearing supporting said disk substrate, said rotatable bearing rotating said disk substrate about a second axis substantially parallel to said first axis; and grinding said circumferential edge of said disk substrate in a ductile grinding regime using said edge finishing apparatus; wherein said grinding step comprises simultaneously rotating said grinding appliance about said first axis and rotating said disk substrate about said second axis, said circumferential edge of said grinding appliance being in contact with said circumferential edge of said disk substrate, said disk substrate and said grinding appliance being rotated in respective directions to provide opposing relative motion of said circumferential edge of said grinding appliance and said circumferential edge of said disk substrate at the location of said contact.