Internal ssd solid state drive series samsung 850 series capacity 256 gb form factor 25 inch height 68 mm design internal memory type 3d v nand bus sata iii sata 600 bus speed 6 buffer 512 mb ram type lpddr2 read speed 550 mbs write speed 520 mbs mtbf 2 000 000 hours shock resistant up to 1 500 g vibration resistant up to 20 g features smart trim support garbage collection device sleep controller samsung 3 core mex weight 66 g po