Engineered specifically for surveillance security systems</br>Reduced video frame loss</br>Tuned for write-intensive?? low bit-rate?? high stream-count applications typical to most surveillance applications</br>Prioritized write-operations for maximized surveillance performance</br>TLER & ATA streaming support.</br>Package includes a hard drive only - no screws?? cables?? manuals included. Please purchase mounting hardware and cables separately if necessary.</br>Ships in WD-certified box for safe transit during shipping</br></br>Product Description</br></br>Western Digital HDD WD40PURX 4TB SATA 6Gb/s IntelliPower 64MB 3.5inch Purple Bulk</br><br/>http://www.amazon.com/gp/product/B00IMPO5OW