Amazon.com: Seagate Skyhawk AI 18TB Video Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 256MB Cache for DVR NVR Security Camera System with in-house Rescue Services - Frustration Free Packaging (ST18000VE002) :
Seagate IronWolf Pro 18TB NAS Hard Drive 7200 RPM 256MB Cache CMR SATA 6.0Gb/s 3.5" Internal HDD ST18000NE000 - Newegg.com
Seagate 18TB Exos X18 7200 rpm SATA III 6 Gb/s 3.5"