An aspect of the invention is a storage networking system comprising subsystems coupled with a network. The chafing barrier comprises a layer of soft padded material, such as foam plastic, wadding, elastic gel, or a similar material. The first connector has tolerances in the direction of insertion. Accordingly, a user or unit may have content delivered in one modality and redelivered in a different preferred modality or modalities. The system is rapidly stopped simply by opening the valve and rapidly started by closing the valve. The invention proposes a solution for eliminating the noise of various origins in the wobble signal, notably the high frequency data leakage into the wobble signal due to radial asymmetry introduced in the diffraction pattern on the detector, whatever the reason for this radial asymmetry.