Western Digital Purple 4TB Surveillance Internal Hard Drive

4TB Capacity/ 64MB Cache/ Advanced Format (AF)/ RoHS Compliant/ 5400 RPM/ Supports Up To 64 Cameras/ Tarnish Resistant Components/ Built For 24/7, Always-On, High-Definition Security Systems/ Reduced Video Frame Loss/ Tuned For Write-Intensive, Low Bit-Rate, High Stream-Count Applications