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WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURX - Newegg.com
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WD40PURX-64GVNYO Western Digital Purple 4TB 5400RPM SATA 6Gbps 64MB Cache 3.5-inch Internal Hard Drive
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WD Purple 4TB Hard Drive for Video Surveillance - Intellipower SATA 6 Gb/s 64MB Cache 3.5 Inch - WD40PURX : Amazon.co.uk: Computers & Accessories
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