| 摘要 |
A grinding operation is effected by rotating the motor hub in high speed around the central axis thereof, and urging the outer peripheral surface of a grinding wheel rotated in high speed around the central axis against the upper surface of the outwardly extending flange for supporting on its upper surface the lower surface of the central portion of the magnetic disk. The surface of the flange can be worked in high precision. Thus, a compact, large capacity, and reliable hard disk drive apparatus is to be provided by reducing the rotational runout of the magnetic disk incorporated within the hard disk drive apparatus.
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