Using DRAM as storage medium, the application range is narrow at present. It follows the design of traditional hard disks, can be set up and managed by the file system tools of most operating systems, and provides industrial standard PCI and FC interfaces for connecting hosts or servers. The application method can be divided into SSD hard disk and SSD hard disk array two kinds. It is a high-performance memory with a long service life and is lacking in the need for independent power supplies to keep your data safe.