WD Blue 3D NAND 250GB Internal PC SSD - SATA III 6 Gb/s, M.2 2280, Up to 550 MB/s - WDS250G2B0B3D NAND SATA SSD for capacities up to 2TB* with enhanced reliability. *As used for storage capacity, one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. Sequential read speeds up to 560MB s and sequential write speeds up to 530MB s.** **As used for transfer rate or interface, megabyte per second (MB s) = one million bytes per second and gigabit per second (Gb s) = one billion bits per second. An