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WESTERN DIGITAL WD Purple Pro WD181PURP - Hard drive - 18 TB - internal - 3.5" - SATA 6Gb/s - 7200 rpm - buffer: 512 MB | Synigo
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Western Digital 18TB WD Purple Pro Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 512 MB Cache, 3.5" - WD181PURP
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