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>WD Purple WD (WD20PURX) 2TB Surveillance 3.5"ernal Hard Drive - WD Purple Surveillance Hard Drives are engineered for 24/7 reliable operation in HD security systems with up to eight hard drives and up to 32 cameras. SINGLE PACK</br><br/>http://www.amazon.com/gp/product/B00IMPO5MOO bu