WD Red Pro WD4003FFBX - hard drive - 4 TB - SATA 6Gb/s - WD4003FFBX - Internal Hard Drives - CDW.com
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Western Digital Red Pro WD4002FFWX 4 TB 3.5" Internal Hard Disk Drive (HDD) SATA III 6.0Gb/s 7200 RPM 128 MB | Fast Server Corp. www.srvfast.com
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Western Digital 4TB WD Red Plus NAS HDD, Internal 3.5'' Hard Drive, 128MB Cache - WD40EFZX - Walmart.com
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