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Seagate IronWolf Pro ST4000NT001 4TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - Newegg.com
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Seagate ST4000NM0035 4TB SATA III 6Gb/s Enterprise 7200RPM 128MB 3.5" 512n Bare