Hybrid surveillance DVRs

Embedded surveillance DVRs (SDVR)
Network video recorders (NVR) 
Surveillance DVRs

Specifications:

ST4000VX015
Capacity:4TB
Interface:SATA 6Gb/s
Cache:256MB
Speed :5400rpm
Up to 180 MB/s Data Transfer Rate
Enables user workload rate of 180TB/year
Many hours of HD video storage
Built to record 90% of the time — supports up to 64 cameras

https://www.seagate.com/internal-hard-drives/hdd/skyhawk/#skyhawk-models