A spindle motor is described having a motor stator, a motor rotor, the motor being energized to cause rotation of the rotor supporting a single disc or a stack of discs which is mounted in such a way that the rotating bottom or top (or both) disc surface is closely adjacent to a stationary disc drive...http://www.google.de/patents/US6239943?utm_source=gb-gplus-sharePatent US6239943 - Squeeze film damping for a hard disc drive
