In a Winchester hard disk drive assembly having at least one disk rotatably disposed on a cylindrical spindle, the improvement compromising spacer means interposed between the inner diameter of said at least one disk and the outer diameter of said cylindrical spindle, said spacer means defining a clearance...http://www.google.de/patents/US4754351?utm_source=gb-gplus-sharePatent US4754351 - Method and apparatus for controlling radial disk displacement in Winchester disk drives
