ST6000DM001 Seagate Desktop HDD 6TB 7200RPM SATA 6Gbps 128MB Cache 3.5-inch Internal Hard Drive
Amazon.com: Seagate Skyhawk 6TB Surveillance Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 256MB Cache for DVR NVR Security Camera System with Drive Health Management (ST6000VX0023) : Electronics
ST6000DM003 Seagate Barracuda 6TB 5400RPM 256M 6Gb/s 3.5" SATA Hard Drive New | eBay
Amazon.com: Seagate SkyHawk 6TB Surveillance Internal Hard Drive HDD – 3.5 Inch SATA 6GB/s 256MB Cache for DVR NVR Security Camera System with Drive Health Management – Frustration Free Packaging (ST6000VX001) : Electronics