TOSHIBA N300 Pro HDWG440XZSTB 4TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - Walmart.com
Amazon.com: HGST Ultrastar 7K6000 4TB 7200 RPM SATA 128MB Cache 3.5" Internal Enterprise Hard Drive - HUS726040ALE610 (0F23005) : Electronics
HP 4TB 7200 rpm SATA III 3.5" Internal SC Midline Hard
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 FireCuda 4TB 7200 RPM SATA III 6Gb/s 3.5" Internal CMR Hard Drive - Micro Center
HUS72404CLAR4000 - EMC 4TB 7200 RPM SAS 3.5" HDD for VNX5100, 5300, 5200, 540... | eBay
HGST 4TB 7200 RPM SAS 3.5" HDD for DS4246, DS212C, FAS2620 0F22948 | eBay