Patent ID: 7443634

Claim:
A storage disk for a hard disk drive, the storage disk comprising: a rigid body region that is substantially homogenously formed, the body region having an unexposed first body side and an unexposed second body side opposite the first body side; a first side region that extends from the first body side to a generally planar exposed first storage surface that stores data, the first side region including a plurality of layers formed from different materials relative to one another, the first side region having a first density; and a second side region that extends from the second body side to an exposed second surface that is opposite the first storage surface, the second surface being generally non-planar, the second side region having a second density that is different than the first density, the second side region including a raised stiffener that forms a portion of the second surface, the second side region including a plurality of layers that are formed from different materials relative to one another.