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This paper is a summary of experimental results in the domain of cost estimations of data access to data stored in the secondary storage. It mainly discusses technical and development issues based on implementation prepared for EU CrossGrid project. The proposed solution is an extension of research in the field of optimization of data access for grid environment, published previously elsewhere. It is important to mention, that the presented solution might seem very simple in comparison with already available ones based on the analytical secondary storage simulation approach, but in contrast to them this method can give precise predictions even if the information about the secondary storage internal architecture is uncertain and incomplete.