Amazon.com: HGST Ultrastar 3.5-Inch 4TB 7200RPM SATA III 6Gbps 64MB Cache Enterprise Hard Drive with 24x7 Duty Cycle (0F14683) : Electronics
WD - BLACK Gaming 4TB Internal SATA Hard Drive for Desktops 7200 RPM 3.5 | eBay
Amazon.com: WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX : Electronics
WD Black 4TB HDD-7200RPM | ProSoft
WD Black Performance 4TB 7200 RPM SATA III 6Gb/s 3.5" Internal CMR Hard Drive - Micro Center
Amazon.com: Seagate Enterprise 4TB Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM, 256MB Cache (ST4000NM004C) : Electronics
04NDPW Dell 4TB 7200RPM SAS 12Gbps Nearline Hot Swap (512n) 3.5-inch Internal Hard Drive
005050971 – Data Domain 4TB 7200 RPM SAS 3.5″ HDD for Data Domain ES30 15 bay enclosure – Disk Drive Finder
Western Digital SE 4TB, 7200 RPM, 3.5 inch Internal Hard Drive - WD4000F9YZ for sale online | eBay
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