This product is either discontinued or we cannot get that from suppliers.
Western Digital WD63PURZ Hard Drive, Buffer 256 MB, Wireless LAN No, Product Family Purple, Drive Interface SATA, Drive Interface Standard SATA/600, Drive Type Internal, Form Factor 3.5", Device Supported Video Surveillance System, Storage Capacity 6 TB, Environmentally Friendly Yes, Environmental Certification RoHS.
WD Purple drives are engineered specifically for surveillance to help withstand the elevated heat fluctuations and equipment vibrations within NVR environments.