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Western Digital Red WD40EFRX 4 TB 3.5" Internal Hard Disk Drive (HDD) SATA III 6.0Gb/s 5400 RPM 64 MB (20PK) | Fast Server Corp. www.srvfast.com
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WD Red 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD40EFRX - Walmart.com
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