WD40PURZ-85TTDY0 Western Digital SATA 6.0 Gbps 4TB Hard Drive
Western Digital Purple 4TB Surveillance 3.5 Inch SATA 6 Gb/s Hard Disk Drive with Allframe 4K Technology - 180TB/yr, 64MB Cache, 5400rpm - WD40PURZ : Amazon.co.uk: Computers & Accessories
WD40PURZ-85TTDY0, DCM , Western Digital 4TB SATA 3.5 Hard Drive