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Amazon.com: HGST Ultrastar 7K6000 4TB 7200 RPM SATA 128MB Cache 3.5" Internal Enterprise Hard Drive - HUS726040ALE610 (0F23005) : Electronics
HGST 4TB 7200 RPM SAS 3.5" HDD for DS4246, DS212C, FAS2620 0F22948 | eBay
1FT278-031 - EMC 4TB 7200 RPM SAS 3.5" HDD for Unity 300, 400, 500, 600 serie... | eBay
Western Digital 4TB Ultrastar DC HC310 3.5" SATA HDD Hard Drive 7200 RPM | eBay
Amazon.com: Seagate Enterprise 4TB Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM, 256MB Cache (ST4000NM004C) : Electronics
TOSHIBA N300 Pro HDWG440XZSTB 4TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - Walmart.com
Seagate Enterprise Capacity 3.5'' HDD 4TB 7200 RPM 512e SAS 12Gb/s 128MB Cache Internal Hard Drive ST4000NM0125 - Newegg.com
Seagate FireCuda 4TB 7200 RPM SATA III 6Gb/s 3.5" Internal CMR Hard Drive - Micro Center
P-X-2UC-4TBS – EMC 4TB 7200 RPM SAS 3.5″ HDD for DD6300, DD6800, DD9300 12 bay enclosures – Disk Drive Finder
Amazon.com: HP 695842-001 4TB SAS Hard Drive Disk (HDD) - 7,200 RPM, 3.5-inch form factor, SmartDrive Carier (SC), Midline (MDL), 6Gb per second Transfer Rate (TR) : Electronics
Seagate Enterprise Capacity 3.5'' HDD 4TB 7200 RPM 512e SATA 6Gb/s 128MB Cache Internal Hard Drive ST4000NM0115 - Newegg.com