Western Digital WD Purple 12TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 256MB Cache 3.5"

WD Purple™ drives are engineered specifically for surveillance to help withstand the elevated heat fluctuations and equipment vibrations within NVR environments. An average desktop drive is built to run for only short intervals, not the harsh 24/7 always-on environment of a high-definition surveillance system.