ST6000VX009.
Seagate Skyhawk ST6000VX009 6TB 3.5" HDD Surveillance Drives; SATA 6GB/s Interface; 8+ Bays Supported; MTBF: 1M Hr's; Camera's supported: Up to 64; Sustained TR: 195MB/s; 256MB Cache; Tarnish Resistant: Yes; Workload Rate: 180; RPM: 5400