A disk drive includes a base, and a spindle motor coupled to the base. The spindle motor includes a hub defining an axis of rotation. The disk drive further includes a disk disposed about the hub and including a disk inner diameter biased against the hub at a contact location of the hub. The disk drive further includes a balancing element including a cylindrical portion disposed about the hub. The balancing element further includes a first cavity defining a first cavity centroid disposed on a same side of the axis of rotation as the contact location, and a second cavity defining a second cavity centroid disposed on a side of the axis of rotation opposite the first cavity centroid. The second cavity centroid is spaced apart from the first cavity centroid in a direction along the axis of rotation.

 
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< Settling judgment method for positioning control device, positioning control device and disk apparatus

> Disk drive cover having a see-through insert including an electrically conductive material

> Laminated magnetic thin films with weak antiferromagnetic coupling for perpendicular magnetic recording

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