Solid state disk data protection and recovery system

The invention belongs to the technical field of solid state disks, and provides a solid state disk data protection and recovery system. The system comprises an interface definition module, a buffer management module and a protection recovery module, the interface definition module allows an application program to distinguish and write data through a protection flag bit, a solid state disk classifies the data into persistent protection data or common data according to the data, and the buffer management module divides a DRAM buffer into a persistent support area and a non-support area. The protection recovery module stores two types of data respectively, manages data access by utilizing a buffer hit table and a list, writes original address information of the persistent data into an out-of-band area of the NAND memory during power failure, and recovers the data to an original position according to the information after power supply recovery; according to the invention, the problem that the data in the DRAM buf