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Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 64 MB Cache, 3.5" - 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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