Seagate SkyHawk 4TB Surveillance Hard Drive – AZAR
Seagate Skyhawk 4TB 5.9K 6Gb/s 3.5" AF SATA Hard Drive ST4000VX007 | eBay
Amazon.com: Seagate Skyhawk ST4000VX013 4 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Network Video Recorder, Video Surveillance System Device Supported : Electronics
Seagate SkyHawk 4TB Surveillance Hard Drive - SATA 6Gb/s 64MB Cache 3.5-Inch Internal Drive (ST4000VX007)