Amazon.com: Seagate BarraCuda Mobile Hard Drive 4TB SATA 6Gb/s 128MB Cache 2.5-Inch 15mm (ST4000LM024),Mechanical Hard Disk : Electronics
Seagate Barracuda Pro ST4000DM006 4 TB 3.5" Internal Hard Disk Drive (HDD) SATA III 6.0Gb/s 7200 RPM 128 MB | Fast Server Corp. www.srvfast.com
WD Blue 4TB Internal SATA Hard Drive for Desktops WDBH2D0040HNC-NRSN - Best Buy
Cheap Western Digital WD4003FZEX 4TB 7.2K RPM SATA 6GBPS | Refurbished
WD Purple WD42PURZ - hard drive - 4 TB - SATA 6Gb/s - WD42PURZ - Internal Hard Drives - CDW.com
WD Black 4TB 3.5-inch Performance Hard Drive | Sweetwater
Dell 4TB 7.2K RPM SATA 6Gbps 512n 3.5in Hot-plug Hard Drive | Dell USA
Amazon.com: Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ : Electronics
Synology 4TB HAT5300 SATA III 3.5" Internal Enterprise
New Original Hdd For Toshiba 4tb 2.5" Sata 6 Gb/s 128mb 5400rpm For Internal Hard Disk For Laptop Hard Drive For Mq04abb400 - Hard Disk Drive - AliExpress
Seagate ST4000DM000 4-TB 5.9K 3.5 6G SATA Hard Drive - TechnoDeals USA
Amazon.com: Seagate BarraCuda 4TB Internal Hard Drive HDD – 3.5 Inch Sata 6 Gb/s 5400 RPM 256MB Cache for Computer Desktop PC Laptop (ST4000DM004) : Electronics
Supermicro 4TB 3.5” SATA3 HDD-T4TB-SM0F26942 Internal Hard Drive