Abstract: Aiming at the storage reliability problem on long-term on-orbit operation equipment,a self-adaptive management strategy for bad blocks was proposed.Firstly,a Markov reliability model is built for the on-board NAND Flash storage system.Secondly,according to the wear condition,the bad block numbers in the device are estimated,and the size of the data storage space is set.Then,based on the actual bad block numbers on orbit,the data storage space is adjusted dynamically,ensuring that a stable storage space is maintained and a higher utilization is achieved within a certain period of time.Finally,the simulation analysis of the self-adaptive management strategy is carried out.The results show that using the strategy at a certain write speed the space utilization rate of the device is not less than 85%.

Key words: On-board memory,NAND Flash,Self-adaptive,Bad block management,Markov