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Amazon.com: Seagate BarraCuda 4TB Internal Hard Drive HDD – 3.5 Inch Sata 6 Gb/s 5400 RPM 256MB Cache For Computer Desktop PC – Frustration Free Packaging ST4000DMZ04/DM004 : Electronics
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Synology HAT5300-4T 4 TB Hard Drive - 3.5" Internal - SATA (SATA/600) : Electronics - Amazon.com
Amazon.com: WD 4TB 3.5 Inch SATA III, 7200 RPM, 64 MB Cache Enterprise Hard Drive (WD4000FYYZ) (Renewed) : Electronics
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Amazon.com: (Old Model) Seagate 4TB NAS HDD SATA 64MB Cache 3.5-Inch Internal Bare Drive (ST4000VN000) : Electronics
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