Revisiting wear leveling design on compression applied 3D NAND flash memory: work-in-progress

Yejia Di, Liang Shi, Congming Gao, Qiao Li, Chun Jason Xue

Abstract: Compression has been demonstrated as an efficient method for lifetime improvement on flash memory. However, data compression ratios are various, which bring proportional wearing on flash pages. Furthermore, the compression schemes have still not been considered in the design of the state-of-the-art wear leveling schemes. Thus, there will be some waste on lifetime exploitation, especially for three-dimensional (3D) NAND flash memory. 3D NAND flash memory is developed to boost the storage capacity by stacking memory cells vertically. However, in 3D NAND flash, one critical characteristic is that its endurance is significantly varied from blocks to pages. Thus, it is necessary to revisit the wear leveling mechanism for compression applied 3D NAND flash memory for further lifetime improvement.