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.

Device Type: Hard drive - internal Capacity: 4 TB Form Factor: 3.5" Interface: SATA 6Gb/s Buffer Size: 256 MB Features: Advanced Format technology, AllFrame, 24x7 availability, Conventional magnetic recording (CMR) Width: 101.6 mm Depth: 147 mm Height: 26.1 mm Drive Transfer Rate: 600 MBps (external) Spindle Speed: 5400 rpm MTBF: 1,000,000 hours 24x7 Operation: Yes Non-Recoverable Errors: 1 per 10^14 Load / Unload Cycles: 300,000 Interfaces: 1 x SATA 6 Gb/s Compatible Bay: 3.5" Software Included: Western Digital Device Analytics Compliant Standards: RoHS 2011/65/EU Service & Support: Limited warranty - 3 years Min Operating Temperature: 0 C Max Operating Temperature: 65 C Shock Tolerance (operating): 30 g @ 2 ms Shock Tolerance (non-operating): 250 g @ 2 ms