Abstract: Disclosed is a system, which divides a memory into a plurality of equally-sized sub-memories and controls an address of each sub-memory, thereby significantly increasing the access speed to an auxiliary memory unit, which comprises a SCSI (Small Computer System Interface) interface controller for converting a SCSI interface bus into a PCI(Peripheral Component Interconnect Bus) interface bus for use in the system, a memory card module for storing data on the PCI interface bus therein, the memory card module being divided into a plurality of equally-sized memory blocks, and a CPU (Central Processing Unit) module for processing writing data on the PCI interface bus in the memory card module and reading out the data therefrom.