SSDS are divided into two types of storage media, one is the use of FLASH chip as storage media, the other is the use of DRAM as a storage medium. Solid hard disk using FLASH chip as storage medium can be widely used in notebook hard disk, memory card, U disk and so on. The other is the use of DRAM as a storage medium SSD, the current scope of application is narrow. 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 biggest advantage of using FLASH chip as solid memory is that it can be moved, and data protection is not controlled by power supply, can adapt to various environments, but the service life is not high, suitable for individual users to use.