Data store system including the buffer for non-volatile memory and the buffer for disk, and data access method of the data store system

A data storage system including a buffer for a non-volatile memory and the buffer for a disk, and a data access method thereof are provided to reduce a data access time for data stored in the non-volatile memory and the disk by using a non-volatile memory buffer and a disk buffer. A data storage system is equipped with a non-volatile memory(170), a disk(180), a non-volatile memory buffer(130), and a disk buffer(140). The non-volatile memory buffer stores a part of areas of the non-volatile memory between a host(110) and the non-volatile memory. The disk buffer stores a part of disks between the host and the disk. The data storage system checks a device corresponding to an access address received from the host in order of the non-volatile memory buffer, the non-volatile memory, the disk buffer, and the disk. The data corresponding to the access address is returned to the host if the access address is found.