Connection of circuit board with housing of disk drive

A magnetic disk drive comprising:

• a base;
• a spindle motor fixed to an inner surface of a bottom of said base;
• a plurality of magnetic disks fixed to and rotated by said spindle motor;
• a plurality of head slider assemblies each comprising a magnetic thin film head which performs read and write of data between it and said magnetic disk associated therewith and a femto slider to which said magnetic thin film head is fixed;
• an actuator configured to move said plural head slider assemblies over said plural magnetic disks;
• a circuit board disposed on an outer surface of the bottom of said base and centrally provided with a hole for fitting therein of a convex portion of said base which convex portion corresponds to said spindle motor;
• three or more outer screws for attaching said circuit board to the bottom of said base at outer end portions of the circuit board;
• and
• three or more inner screws for attaching said circuit board to the bottom of said base at inner positions of the circuit board with respect to said three or more outer screws,
• wherein said three or more inner screws are disposed adjacent said hole and the center of gravity of said spindle motor is positioned within a polygon defined by said three or more inner screws.

A disk drive comprising:

• a base;
• a motor for rotating a recording disk, said motor being fixed to an inner surface of a bottom of said base;
• a circuit board disposed on an outer surface of the bottom of said base;
• outer fixing means for fixing said circuit board to the outer surface of the bottom of said base at outer end portions of the circuit board;
• and
• inner fixing means for fixing said circuit board to the outer surface of the bottom of said base at inner positions of the circuit board with respect to said outer fixing means, the center of gravity of said motor being positioned within a polygon defined by fixing locations of said inner fixing means.