Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 64 MB Cache, 3.5" - WD40PURZ
Brand: Western Digital
Color: Purple
Built for 24/7 surveillance
AllFrame technology for better performance
Designed to support up to 64 HD cameras
Engineered for compatibility
3-year manufacturer's limited warranty