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Western Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256MB Cache, 3.5" - WD180PURZ
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WD Purple Pro Surveillance 18TB Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, 512 MB Cache, 3.5" WD181PURP
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Western Digital Purple Pro enterprise HDDs up to 18TB optimised for DVR/NVR launched in India: Price, specifications | Gadget Times
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Western Digital 18TB Purple Pro Surveillance Internal Hard Drive - 7200RPM, SATA 6GB/s, 512MB Cache, 3.5" - WD181PURP - Newegg.com
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