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WD Surveillance Purple 4TB 64MB SATA3 HDD , 24x7 always on Reliability ,Built for personal, home office or small business surveillance systems using up to 64 cameras. AllFrame 4K Technology
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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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