A data storage infrastructure is disclosed for a communication network that produces a plurality of data flows of network data. A face member is fixed on the head body so as to seal the gel in the recess portion. The bias at a given position of the disk is then calculated based on the estimated linear bias component and the extracted nonlinear bias component. The safety construction comprises at least two mutually firmly connected elements which upon exceeding of a defined threshold load are separated and movable with respect to one another.