Seagate SkyHawk 6TB Surveillance Hard Drive 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive ST6000VX0023 - Newegg.com
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
Amazon.com: Seagate Enterprise Capacity 3.5 HDD 6TB 7200RPM 12Gb/s SAS 128 MB Cache Internal Bare Drive ST6000NM0034 : Electronics