Western Digital Purple 3.5 Inch 14TB Serial ATA HDD WD Purple drives have been engineered specifically for the extreme demands of high temperature, 24/7 surveillance systems. From a worldwide leader in the storage industry, WD Purple is engineered for quality video playback when you need it most. WD Purple drives are optimized to support up to 64 cameras, giving you flexibility to upgrade or expand your security system.Please note this item is non-returnable, see our returns policy for more information.