Enhancing Endurance of Huge-Capacity Flash Storage Systems by Selectively Replacing Data Blocks

The wear leveling is a critical factor which significantly impacts the lifetime and the performance of flash storage systems. To extend lifespan and reduce memory requirements, this paper proposed an efficient wear leveling without substantially increasing overhead and without modifying Flash Translation Layer (FTL) for huge-capacity flash storage systems, which is based on selective replacement. Experimental results show that our design levels the wear of different physical blocks with limited system overhead compared with previous algorithms. key words: wear leveling, flash memory, selective replacement, hugecapacity storage systems