Asymmetrical storage disk for a disk drive

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, wherein the second side region includes an exposed projection having a height that is at least approximately 0.001 millimeters.

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 surface layer having a region 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 a generally non-planar, exposed second surface layer that is opposite the region that stores data of the first surface layer, the second surface layer being formed from a different material than the first surface layer, the second side region having a second density that is different than the first density, the second side region including a plurality of layers that are formed from different materials relative to one another.

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 surface layer having a region 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 a generally non-planar, exposed second surface layer that is opposite the region that stores data of the first surface layer, the second surface layer being formed from a different material than the first surface layer, the second side region having a second density that is different than the first density, the second side region including an exposed projection having a height that is at least approximately 0.001 millimeters.