A method and apparatus for polishing hard discs uniformly while minimizing frictional electricity between the discs and polishing materials as well as preventing from frictionally heated deformation. A turntable for placing a disc thereon is freely rotatable without being connected to any motor or other...http://www.google.se/patents/US6116987?utm_source=gb-gplus-sharePatent US6116987 - Method of polishing hard disc and polishing apparatus therefor
