Seagate 3TB Surveillance Video HDD SATA 6Gb/s NCQ 64MB Cache 3.5-Inch Internal Bare Drive (ST3000VX002) Ideal for enhanced video surveillance reliability, cost savings and data analytics Precision-tuned for high write surveillance workloads operating 24x7 Capacities up to 6TB support up to 16 drives and 32 cameras per system Reliably performs in multi-drive systems with RAID support Rescue Recovery Service Option available for 360 degree data protection 3 year warranty. 128 MB Cache