An endurance solution for solid state drives with cache

NAND flash memory has become one of the most popular storage media for portable devices, such as MP3 players, MMC cards and solid state drives (SSDs). Due to erase-before-write characteristics of NAND flash memory, wear-leveling strategy is very important in determining the performance and lifetime of NAND flash memory in solid state drives. In this paper, to prolong the lifetime and improve the performance of SSDs with cache, we propose an effective wear-leveling algorithm based on a novel “triple-pool” design. Comparing with previous wear-leveling algorithms, experimental results show that our algorithm lengthens the lifetime and reduces the write amplification.

► We propose an effective wear-leveling algorithm based on a novel “triple-pool” design.
► Previous wear-leveling algorithms lead to extra read and write operations, but the proposed algorithm does not.
► Our algorithm has obvious advantages: better wear leveling, lower write amplification and less execution time.