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
3 terabyte surveillance hard drive
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Western Digital launches surveillance-oriented WD Purple series of 3.5" HDDs - PC Perspective
3 terabyte surveillance hard drive
WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURX - Newegg.com