The present invention relates to a chemical process for providing a tortoise-shell chromatic effect to nickelated metallic substrates, which comprises heating the metallic substrate to 100-110 C. The MIMO models can then be utilized by the predictive controller to manage storage resources on a distributed storage system. The actuator may be formed as a small piston that may be actuated both by positive pressure and negative pressure to move the clamp between clamping and unclamped positions. In accordance with another embodiment, a user may control the downloading of each of the media items, as desired.