Disk drive device, disk drive apparatus with the same, and method of manufacturing disk driving device

A method of manufacturing a disk drive device comprising a spindle motor having a pivot and a substantially cylindrical hub configuring a rotor and supported rotatably on the pivot;

• a disk shaped recording medium fitted coaxially to an outer circumference of the hub;
• an elastic annular spacer including a contact portion which is in contact with the recording medium, and mounted on an end portion of the outer circumference of the hub with a gap;
• and a ring shaped clamp member fitted to the end portion of the outer circumference of the hub by a shrinkage fitting, the clamp member holding the spacer in a state contacted with the recording medium, the method comprising:
• fitting the recording medium to the outer circumference of the hub of the spindle motor;
• mounting the spacer onto an end portion of the outer circumference of the hub with a gap and bringing the contact portion of the spacer to contact with the recording medium;
• and
• fitting the clamp member on the end portion of the outer circumference of the hub by a shrinkage fitting, and at the time, contacting an engaging portion provided on one of the spacer and the lamp member with a guide surface provided on the other so as to guide the spacer in a direction wherein a center of the contact portion of the spacer coincides with a rotation center of the hub for positioning.