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Western Digital WD Purple Surveillance 7 mm SATA HDD Internal Hardisk, 5400RPM, 64MB (6 TB, 6.0G, WD60EJRX) - EXPANSYS Hong Kong
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WD Purple 6TB Surveillance Hard Drive Review | eTeknix
Western Digital Purple 6TB 3.5'' Surveillance Hard Drive, SATA 6 Gb/s, 64MB Cache Size,