Seagate 8TB Enterprise Capacity 7200 rpm SAS, 12Gb/s SAS, Capacity-Optimized Enterprise Hard Drive, 8TB, 3.5-inch enterprise drive with industry-leading 6-disk technology, Engineered for 24×7 workloads of 550TB/yr—10× that of desktop drives.

WD Surveillance Purple (3.5"), 2TB, Interface: SATA 6Gb/s, Buffer Size: 64 MB, IntelliPower, 5400 RPM, SATA3

Seagate Skyhawk 8TB Hard Drive, 256MB Cache, 4096 Bytes per Sector, SATA 6Gb/s interface, Up to 64 Camera Supported, Tarnish-resistant

Seagate 2TB Surveillance HDD, 64MB Cache, 4096 Bytes per Sector, 5900 RPM, Up to 32 Cameras Supported, 24x7 operational capabilities, SATA 6Gb/s interface

Seagate 1TB Surveillance HDD, 64MB Cache, 4096 Bytes per Sector, 5900 RPM, Up to 32 Cameras Supported, 24x7 operational capabilities, SATA 6Gb/s interface