| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of the wobbling of a surface and to obtain a good head medium interface effect by effectively degrading the rigidity of a magnetic disk fastened to a center core member by a change in its structure. SOLUTION: This center core member is constituted by forming an attraction member 11 by a ferromagnetic material to be attracted to a magnetic attraction part disposed in a rotary spindle part for rotationally driving the magnetic disk 1 and a flexible annular flat plate part 12 fastened with the magnetic disk 1 as separate bodies and integrating both.
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