3TB Hard Drive optimized for 24/7 operation in WD Purple CCTV systems, 3.5 ”Surveillance Hard Drive, 3TB capacity, Cache 64MB, SATA III 6Gb / s interface, Sustained transfer rate 145MB / s, rotation speed 5900RPM. MTBF 1,000,000hours. 300 000 Load / Unload cycles. Workload 180TB / Year. Average consumption 4.4W. Operating temperature 0 ° C ÷ 65 ° C.