Patent ID: 7295400
Filing Date: 2007-11-13
Classification: G11B,Y10T

Abstract:
1. A method of making a balanced disk pack, for a hard disk drive, from a disk pack including a spindle motor rigidly coupled, and aligned by at least two open screw holes, with a disk clamp, wherein said method comprises, for each of said open screw holes, of the steps of: analyzing said disk pack for a balancing operation for said open screw hole; performing said balance operation for said open screw hole, further comprising said steps of: selecting a mechanical counterbalance, comprising a cylindrical shaft centered around a principal axis and a balance head asymmetric about said principal axis including a concave interior face and a convex exterior face, for said open screw hole to create a selected counterbalance of a total mass, if a balance action is determined for said open screw hole; and inserting said selected counterbalance into said open screw hole until said mechanical counterbalance locks into said open screw hole with said concave interior face locked toward said spindle motor and with said convex exterior face locked away from said spindle motor to at least partially create said balanced disk pack, if said balance action is determined for said open screw hole.