Probiotic compositions derived from Lactobacillus casei ATCC number PTA 3945 are disclosed. The controller includes a memory arbiter that monitors memory access requests from requesters in the NP and awards high priority requesters all the memory bandwidth requested per access to the memory. The formulations of such agents or substances form part of the invention. The dual pulley mechanism is smaller than previous spiral pulley mechanisms. As the disc rotates, the air bearing surface causes the slider to fly over the disc surface.