Cache system adopting an LRU system.

摘要

The present invention provides a cache system comprising a cache memory. This cache system uses a resident bit in each entry of a directory memory (35₁) and a resident designation bit in the read command, in such a way that a data block specified by a disk read instruction resides in the cache memory at least until the resident bit is reset in response to the resident designation bit in the read command, in order to achieve a high performance of the disk structure.