FTL: Improving SSD Lifetime via Exploiting Content Locality
NAND flash-based SSDs suffer from limited lifetime due to the fact that NAND flash can only be programmed or erased for limited times. Among various approaches to address this problem, the authors propose to reduce the number of writes to the flash via exploiting the content locality between the write data and its corresponding old version in the flash. This paper locality means, the new version, i.e., the content of a new write request, shares some extent of similarity with its old version. The information redundancy existing in the difference (delta) between the new and old data leads to a small compression ratio.