WD Blue Mainstream 4TB 5400 RPM SATA III 6Gb/s 3.5" Internal SMR Hard Drive - Micro Center
WD Black 4TB 3.5-inch Performance Hard Drive | Sweetwater
Amazon.com: HGST Ultrastar 3.5-Inch 4TB 7200RPM SATA III 6Gbps 64MB Cache Enterprise Hard Drive with 24x7 Duty Cycle (0F14683) (Renewed) : Electronics
Dell 4TB 3.5in SAS Hard Drive ST4000NM0023
Seagate 4TB 3.5in SAS Hard Drive ST4000NM0125
Seagate 4TB 3.5in SAS Hard drive ST4000NM0023
Nimble SP-HDD-4TB 4TB 7.2k 3.5" w/Tray
Synology 4TB HAT5300 SATA III 3.5" Internal Enterprise
Amazon.com: Western Digital Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - Western Digital40PURZ [Old Version] : Electronics