The vibrancy aroused by imbalance will prick up if only the optical disc exits eccentricity quality when principal axis motor rotated at so high speed. It is very difficult for optical head to focus and follow track.

• 在如此高的转速下,只要光盘有一点偏心质量存在,不平衡量所造成的振动就会加剧,给光学头的聚焦和循轨造成极大的困难。