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WD40PURX - Western Digital Purple 4TB 5400RPM SATA 6Gb/s 64MB Cache (RoHS) 3.5-Inch Surveillance Hard Drive
Amazon.com: Western Digital Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - Western Digital40PURZ [Old Version] : Electronics