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WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD40PURZ
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Western Digital Purple Surveillance WD40PURZ 4TB 5400RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - 3 Year Warranty
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