The ThinkPad 128GB SATA 6.0Gb/s Solid State Drive II option provides a rugged, light and reliable performance utilizing MLC NAND flash based technology helps to improve boot time and data transfers when compared to Hard Disc Drives (HDD) alternatives. The SSD speeds make day to day tasks speedier when leveraging the SSD capacity for cache and boot up while enabling you to maximize your hard drive capacity for storage.