Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD SATA 6 Gbs 256 MB Cache 35 WD43PURZ

Engineered for mainstream surveillance systems, WD AllFrame technology delivers optimizations for write-intensive, low bit-rate, high stream-count workloads typical to mainstream surveillance applications, Supports up to 180 TB/yr workload rate(3) (3) Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ✕ (8760 / recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations., Support for up to 16 bays(7) (7) 1TB through 2TB support up to eight bays; 3TB and above support up to 16 bays., Tarnish-resistant components(6) (6) Tarnish resistant components for capacities 3TB and higher.