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
Tomshine Purple 6TB HDD 3.5 inch WD60EJRX 5400RPM 64MB Cache SATA Mechanical Hard Drive for 24*7 Video Recording - Walmart.com