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Amazon.com: Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 64 MB Cache, 3.5" - WD40PURZ : Electronics
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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
WD40PURZ- Western Digital 4TB SATA 6Gb/s SC HA500 Cache Purple Hard Drive | eBay
WD40PURZ-85TTDY0, DCM , Western Digital 4TB SATA 3.5 Hard Drive