WD Purple 4TB SATA HDD 3.5inch internal 256MB Cache

WD Purple drives are designed to meet the challenges of 24 x 7 video surveillance recording. These 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. With WD Purple drives, you get reliable, surveillance-class storage that's tested for compatibility in a wide range of security systems. Great AllFrame technology helps reduce frame loss and improve overall video playback.
Product Description: WD Purple WD43PURZ - hard drive - 4 TB - surveillance - SATA 6Gb/s | Type: Hard drive - internal | Capacity: 4 TB | Form Factor: 3.5" | Interface: SATA 6Gb/s | Data Transfer Rate: 600 MBps | Buffer Size: 256 MB | Spindle Speed: 5400 rpm | Features: Advanced Format technology, Conventional magnetic recording (CMR), AllFrame, 24x7 availability | Dimensions (WxDxH): 101.6 mm x 147 mm x 26.1 mm | Manufacturer Warranty: 3-year warranty