Abstract: The hit ratio in an automated storage library is maximized by tracking the frequency of usage of each file and rewriteable storage medium therein. For each file therein, the library counts the number of times such files are accessed. For each storage medium therein, the library counts the number of mounts thereof. Periodically, the usage statistics are reviewed to determine the most frequently used files and storage media in the library. The most frequently used files are then transferred to the most frequently used storage media, which then become still more frequently used. The less frequently used files are transferred to the less frequently used storage media, which become still less frequently used. By definition, the most frequently used storage media are the most likely to be mounted, thereby increasing the hit ratio.