A magnetic recordingreproducing apparatus is disclosed wherein reproduced signals read out from a plurality of recording tracks using a reproducing head can be separated into original recording signals of the recording tracks. The simulation of a fluid in accordance with the present invention has inherent positive hyperviscosity and hyperdiffusivity for very small values of viscosity and thermal diffusivity, and short wavelength modes are shown to be stable for temperatures above a lower limit. The sectors being organized into blocks with each sector identified by a host provided logical block address. The retentate is used to support combustion of the fuel injected by the fuel injector.