At the time of writing, the WD Purple 6TB Surveillance Hard Disk can be found at NewEgg for $256.99 , at Overclockers UK for £214.99 , or through Geizhals starting from €251.04 . One should never compromise when it comes to safety and surveillance falls within that category.
Overall great performance; Great price per GB of storage; WD AllFrame technology; Up to 8 drives; Uo to 32 HD cameras
Mechanical drive: higher noise and power consumption than solid state