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Western Digital WD Purple 1T 2T 4T 6T 8TB 10TB 3.5" Hard Drive Surveillance HDD SATA 6.0Gb/s Disk for cctv Camera AHD DVR IP NVR - AliExpress
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WD Purple 6TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD60PURX [Old Version] : Electronics - Amazon.com
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