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HGST/WD Ultrastar 4TB 7200 RPM 512e SATA 6Gb/s 3.5-Inch Enterprise Hard Drive (HUS726T4TALE6L4) - Newegg.com
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HGST Deskstar 3.5-Inch 4TB 7200 RPM SATA III 6Gbps 64MB Cache (0F14681) | eBay
X477A-R6 – NetApp 4TB 7200 RPM SAS 3.5″ HDD for DS4243, DS4246 24 bay enclosures – Disk Drive Finder
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HGST Deskstar NAS 3.5" 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s High-Performance Hard Drive for Desktop NAS Systems Retail Packaging - Newegg.com
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WD Red Pro 4TB 7200 RPM 3.5" Internal Hard Drive - Newegg.com
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Amazon.com: HGST WD Ultrastar HUS726T4TALE6L4 4TB 7200 RPM 512e SATA 6Gb/s 3.5-Inch Internal Hard Disk Drive : Electronics
0F22948 – NetApp 4TB 7200 RPM SAS 3.5″ HDD for DS4243, DS4246 24 bay enclosures – Disk Drive Finder
NeweggBusiness - Toshiba X300 4TB Performance Desktop and Gaming Hard Drive 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5 Inch Internal Hard Drive Retail Packaging HDWE140XZSTA
Western Digital RE WD4000FYYZ 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive - w/3 Years Warranty - Walmart.com
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Seagate FireCuda 4TB 7200 RPM SATA III 6Gb/s 3.5" Internal CMR Hard Drive - Micro Center
Dell 9ZM270-150 4TB 3.5" SAS Hard Disk Drive HDD (ST4000NM0023)