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The Western Digital Red NAS hard drive is a Network Attached Storage hard drive. It has a capacity of 4TB and fits in standard 3.5 drive bays. It

WD RED 4TB, 64MB CACHE, 5400 RPM, 3.5 SATA III NAS HARD DRIVE (UNTESTED/AS-IS)

Western Digital 4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5 - WD40EFAX : Electronics

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WD Red Pro WD4003FFBX - hard drive - 4 TB - SATA 6Gb/s - WD4003FFBX - Internal Hard Drives

Original Western Digital WD Red NAS 4TB 3TB 3.5 Internal Hard Drive HDD SATA 6GB/S 2TB 1TB SATA 64 MB Cache HDD For Desktop - AliExpress

Original Western Digital WD 4TB Red NAS Hard Disk Drive 3.5 4TB Internal Hard Drive 5400RPM SATA 6Gb/s 64MB Cache For Desktop