Seagate SkyHawk 1TB 256MB Cache 3.5 inch Internal

Seagate SkyHawk 4TB 256MB Cache 3.5 inch Internal Surveillance Hard Disk Drive - SATA III 6 Gb/s Interface, , 3 year warranty

Seagate SkyHawk AI 10TB 256MB Cache 3.5 inch Internal Surveillance Hard Disk Drive - SATA III 6 Gb/s Interface, , 3 year warranty

Western Digital Purple - 2.0TB 3.5" SATA3 6.0Gbps Surveillance HDD, Intellipower™ Speed Management, 256MB Cache, 150MB/s Host to/from (Sustained), AllFrame, HD Video Optimised, , 2 year warranty

Western Digital Purple - 8.0TB 3.5" SATA3 6.0Gbps Surveillance HDD, 128MB Cache, , 2 year warranty