Form factor 3.5-inch Interface SATA 6.0 Gbit/s Advanced Format (AF) yes RoHS compatible yes Halogen FreeYes Shock Sensor yes, Performance Rotational speed 7,200 rpm Buffer size 512 MB (14 TB HDWR31E, 16 TB, 18 TB), 256 MB (4 TB - 12 TB, 14 TB HDWR21E) Average latency 4.17 ms Native Command Queing (NCQ) supported