| 摘要 |
A magnetic disk and spindle motor are mounted in a housing member. A support arm is freely rotatably mounted on a cover member. A suspension has a dimple (first mark) indicating the mount position of the magnetic head slider and a through hole (second mark) formed at any different position form the dimple. The cover member has measuring holes, through which the respective marks are observed from the opposite side to the support arm mount surface.
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