The wear-leveling algorithm significantly impacts the lifetime and performance of solid-state storage systems in smart meters.To prolong the lifespan

this paper proposes a wear leveling design which can reduce the maximum erase-cycle difference.According to the erase-cycle difference between blocks pointed by the position pointers

our proposed design actives the wear-leveling algorithm and picks the data block needed to be replaced for wear leveling.Experimental results show that our design reduces the maximum erase-cycle difference and standard deviation

and effectively levels the wear even

which is compared with previous methods.The trigger threshold impacting wear leveling is also discussed

and the conclusion that the balance between wear leveling and time cost need to be considered is obtained in the choice of trigger threshold.