The Western Digital WD40PURX 4TB Hard Drive is made for 24/7 CCTV security camera recording, which works smoothly with home and business DVR/NVR systems to record sharp HD videos continuously without lagging or losing frames. High Storage Capacity: It has 4TB capacity, that can stores weeks of high-definition video recording without running out of space. 24/7 Continuous Recording: Made specifically to run non-stop, day and night, in security systems. No Frame Drops: With it's AllFrame technology ensures smooth video playback without lagging or losing footage. Supports Up to 64 Cameras: Optimized to continuously stream and keep video from up to 64 HD security cameras. Built for Surveillance: It can handle heavy video writing better and safer than standard computer hard drives. Cool & Efficient: Low power consumption reduces from getti ...