Form factor: 3.5-inch Interface: 6.0 Gbit/s Number of cameras supported: up to 64 Drive bays supported: 1 to 8 Advanced Format (AF): yes RoHS compatible: yes Halogen Free: Yes Shock Sensor: Yes Rotational speed: 7200rpm Data transfer speed (sustained): 157 MB/s Typ. (4 TB CMR) Buffer size: 128 MB (2 TB SMR, 4 TB CMR) Limited warranty: 3 years