Solid-state hard disk (IDE flash disk) consists of control unit and storage unit (flash chip). Simply put, it is a hard disk made of solid-state electronic memory chip array. The interface specification, definition, function and usage of solid-state hard disk are the same as those of ordinary hard disk, and the appearance and size of the product are also the same as those of ordinary hard disk. The working temperature range of the chip is very wide (-40~85℃). At present, it is widely used in military, vehicle, industrial control, video monitoring, network monitoring, network terminals, electric power, medical care, aviation, navigation equipment and other fields. Although the current cost is high, it is gradually spreading to the DIY market. Because solid-state hard disk technology is different from traditional hard disk technology, there are many emerging memory manufacturers. Manufacturers only need to buy NAND memory and cooperate with appropriate control chips to manufacture solid-state hard disks. SATA-2 interface and SATA-3 interface are widely used in the new generation of solid state drives.