SPINDLE SYSTEM, ELECTROMAGNETIC CONVERSION PROPERTY EVALUATING APPARATUS AND INFORMATION STORAGE DEVICE

A spindle system includes: a spindle motor section controlled to rotate at a predetermined speed; and a clamp base section disposed at an upper part of the spindle motor section and having screw holes that are formed in a side surface of the clamp base section and extend in a radial direction. The spindle system further includes: screws respectively inserted into the screw holes and changing a center of gravity of the clamp base section; a clamp fixing section that fixes the spindle motor section and the clamp base section; and an elastic member disposed between the clamp base section and the clamp fixing section, and contacted by and pressed against the screws.