A Bad Block Management Design Based on Space-Borne Nand Flash Parallel Storage System

Multi-channel parallel technology is applied in space-borne storage system for high-speed data transmission. An optimized design based on bad block replacing is proposed, which adopts the redundancy architecture in MRAM (magneticrandom accessmemory) for high-reliability and hardware acceleration. A high-efficient of data storage is obtained in the design with combine of hash table and bad block replacing in reverse order. In process of high-speed data storage, data error caused by runtime bad block is solved by the replay scheduler of Nand Flash orders. According to the results of experiments, the efficiency of data storage in the proposed design is more than 10 times higher than traditional bad block management. With a solution of space loss caused by bad block random distribution, the rate of data space usage in Nand Flash array is increased to 98%. The reliability of the proposed design achieves 0.99 on orbit, which provides technical support for the development of high-speed large-capacity on-board storage system.