Patent ID: 8077432
Filing Date: 2011-12-13
Classification: G11B

Abstract:
1. A disk stack assembly for attachment to a disk drive spindle motor having an axis of rotation, the assembly comprising: a spindle motor hub having a central axis coincident with the spindle motor axis when mounted on the spindle motor and an outer cylindrical surface; a flange extending from the outer cylindrical surface of the hub for supporting a disk, the flange having a generally conical surface defined by a radially inner circular ridge and a radially outer circular edge, the radial difference between the radially inner circular ridge and the radially outer circular edge being ΔR and the axial spacing between the radially inner circular ridge and the radially outer circular edge being Z a disk having its radially inner portion on the flange and in contact with the ridge, whereby the flange conical surface diverges away from the disk in the radially outward direction; a disk spacer ring on the radially inner portion of the disk; and a clamp attached to the hub and having a clamping surface for clamping the spacer ring and disk.