WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURX

Engineered specifically for surveillance security systems. Supports up to 180TB/year workload rate. Tuned for write-intensive, low bit-rate, high stream-count applications typical to most surveillance applications. Prioritized write-operations for maximized surveillance performance. TLER & ATA streaming support. Support for more than eight bays.