An anterior cervical plating system includes moveable plate segments to vary the overall length of the plate and allow andor cause intersegmental compression of vertebral bodies. A first disk is clamped to the rotor, wherein the first disk comprises a reference servo pattern. Each of the objects include an object name and information regarding the meaning of the object, are generated. When the disk reappears, the data in the file may be used to restore a file or file system on the disk to a consistent state.