Seagate SV35 3TB 7200RPM SATA 6-Gb/s 64MB Cache 3.5-Inch Internal Drive for Video Surveillance (ST3000VX000)

Ideal for entry-level surveillance DVRsCapacities up to 3TB support systems with 1-8 drive bays and up to 32 camerasPrecision-tuned for high write surveillance workloadsFor additional features to support NVR applications check out Seagate Surveillance HDDB