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Amazon.com: Western Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256MB Cache, 3.5" - WD180PURZ : Electronics
WD 18TB UltraStar DC HC550 7200 rpm SATA III 3.5" 0F38459 B&H
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Seagate 18TB IronWolf Pro SATA III 3.5" Internal NAS HDD (CMR, Retail) - Media Storage Group
Seagate 18TB Exos X18 7200 rpm SATA III 6 Gb/s 3.5"