 Over time, the performance gap between the central processing units (CPUs) and electromechanical storage (hard disk drives and their RAID setups) widened, requiring advancements in the secondary storage technology.A solution was found in flash memory, which is an electronic non-volatile computer storage media that can be electrically erased and reprogrammed.Solid-state storage typically uses the NAND type of flash memory, which may be written and read in chunks much smaller than the entire size of the storage device.