Provided is a spindle motor for a disk drive including a base, a sleeve fixed on the base and having a space portion therein, and a shaft rotatably installed in the space portion of the sleeve and having a shape such that a diameter of the shaft decreases from a middle portion of the shaft in a lengthwise direction to both ends thereof.

 
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< Head-gap calculating device, storage device, head-gap calculating method, and computer product

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

> Disk drive including a balancing element with first and second cavities and a cylindrical portion disposed about a spindle motor hub
~ 00516