2516	 Hierarchical Storage in Information Retrieval	 A probabilistic analysis is employed to determine the effect of hierarchical storage organizations on information retrieval operations. The data storage hardware is assumed to consist on n-levels of linearly connected memory hardware with increasing data access times and increasing data storage capabilities. A system might for example consist of fast semiconductor memory computer core memory extended core storage disk memory and data cells. Equations are derived to predict the effect of such a system on data access times using sequential files random access files and structured files employing multiple-hierarchical linked lists. information retrieval hierarchical storage
