How much can data compressibility help to improve NAND flash memory lifetime

摘要: Although data compression can benefit flash memory lifetime, little work has been done to rigorously study the full potential of exploiting compressibility improve lifetime. This attempts fill this missing link. Motivated by fact that cell damage strongly depends on content being stored, we first propose an implicit approach (i.e., compress each sector but do not increase number sectors per page) as a complement conventional explicit aims page. Due runtime variation compressibility, page almost always contains some unused storage space left compressed sectors. We develop set design strategies for such reduce overall physical damage. derive mathematical formulations quantitatively estimate reduction gained proposed both and compression. Using 20nm MLC NAND chips, carry out extensive experiments quantify dependency damage, based upon which empirically evaluate compare effectiveness under wide spectrum characteristics.