WD Black 4TB 3.5-inch Performance Hard Drive | Sweetwater
Amazon.com: WD Purple NV 4TB Surveillance Hard Disk Drive - Intellipower SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4NPURX : Electronics
Seagate 4TB BarraCuda 5400 RPM 128MB Cache SATA 6.0Gb/s 2.5" 15mm Laptop Internal Hard Drive ST4000LM024 - Newegg.com
Seagate BarraCuda Mobile Hard Drive 4TB SATA 6Gb/s 128MB Cache 2.5-Inch 15mm (ST4000LM024) - Walmart.com
Synology 4TB HAT5300 SATA III 3.5" Internal Enterprise
Western Digital Gold WD4003FRYZ 4 TB Hard Drive 3.5 Internal SATA SATA600 Server Storage System Device Supported 7200rpm 5 Year Warranty - Office Depot
WD Blue 4TB Desktop Hard Disk Drive - 5400 RPM SATA 6Gb/s 256MB Cache 3.5 Inch - WD40EZAX - Walmart.com
ThinkSystem ST50 3.5" 4TB 7.2K SATA 6Gb Non-Hot Swap 512n HDD | Lenovo US