Seagate SkyHawk ST4000VX016 4TB 3.5″ Surveillance HDD, SATA 6Gb/s, 256MB Cache

Seagate SkyHawk ST4000VX016 4TB 3.5" Surveillance HDD, SATA 6Gb/s, 256MB Cache
High-performance 4TB SATA NVR CCTV hard drive
Built faster for video DVR and NVR security camera system
sustained data rates up to 180 MB/s and burst speeds of 6 Gb/s
Supports workloads up to 180 TB per year

1M hours MTBF, an included three-year limited