Wd Red Wd40efax 4 Tb Hard Drive - 3.5" Internal - Sata (sata/600) - Storage System Device Supported - 5400rpm : Target
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Amazon.com: 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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