WESTERN DIGITAL ULTRA 14TB 3.5 INCH HDD 512MB 7200 ENTERPRISE

Experience the highest capacity, and the thinnest 2.5-inch hard drive you’ve ever seen. Choose from 500 GB to 2 TB of massive storage for all of your application and data needs along with a slim 7 mm form factor drive that makes system upgrades very easy.

Seagate SkyHawk 4TB SATA3 HDD , durable reliability and performance tuned to the high-write workloads of today 24Hours&7days video surveillance systems ( 3 years warranty )

Seagate SkyHawk 6TB SATA3 HDD, Durable reliability and performance tuned to the high-write workloads of today 24 Hours & 7days video surveillance systems (3 years warranty)