Solid state hard disk, referred to as solid state disk, solid state hard disk with solid state electronic storage chip array and made of hard disk, by the control unit and storage unit (FLASH chip, DRAM chip) composition. Solid state hard disk in the interface specifications and definitions, functions and methods of use with the ordinary hard disk is identical, in the product shape and size is also completely consistent with the ordinary hard disk. It is widely used in military, automotive, industrial control, video surveillance, network monitoring, network terminals, power, medical, aviation, navigation equipment and other fields.