Hard disk drive multiple contact disk spindle motor hub flange

A disk spindle assembly, the spindle assembly comprising:

• a hub;
• and
• a hub flange extending radially from the hub and configured to apply a clamping force to secure disk media to the hub, the hub flange comprising:
• a top side and a bottom side, and
• multiple protrusions extending from a surface of the top side and configured to contact a disk medium at multiple respective contact positions of the disk medium in response to application of a clamping load;
• wherein:
• each of the multiple protrusions comprises an annular protrusion circumscribing the hub, and
• the multiple protrusions comprise an inner annular protrusion having a first center height and an outer annular protrusion having a second center height greater than the first center height.

A method for coupling disk media to a spindle, the method comprising:

• positioning a bottom disk medium onto a spindle hub and in contact with a hub flange extending radially from the hub, wherein the hub flange comprises multiple protrusions extending from a top side, wherein:
• each of the multiple protrusions of the hub flange comprises an annular protrusion circumscribing the hub, and
• the multiple protrusions of the hub flange comprise an inner annular protrusion having a first center height and an outer annular protrusion having a second center height greater than the first center height;
• positioning middle disk media over the bottom disk medium onto the spindle hub with disk spacers interleaved between adjacent disk media;
• positioning a top disk medium over the middle disk media onto the spindle hub;
• positioning a disk clamp over the top disk medium, wherein the disk clamp comprises multiple protrusions extending from a bottom side;
• and
• fastening the disk clamp to the spindle thereby forcing the multiple protrusions of the disk clamp to contact the top disk medium at multiple respective contact positions of the top disk medium and forcing the multiple protrusions of the hub flange to contact the bottom disk medium at multiple respective contact positions of the bottom disk medium.