Amazon.com: Seagate Portable 4TB External Hard Drive HDD – USB 3.0 for PC, Mac, Xbox, & PlayStation - 1-Year Rescue Service (STGX4000400) : Electronics
Shop ST4000NM0125 Seagate 4TB 7.2K 12Gbps 512e SAS 3.5 Inch Hard Drive for enterprise class servers
Seagate Barracuda ST4000DM004 - hard drive - 4 TB - SATA 6Gb/s - ST4000DM004 - Internal Hard Drives - CDW.com
Seagate ExpansionPLUS 4TB External Hard Drive HDD - USB 3.0 with Rescue Data Recovery Services and Toolkit Backup Software (STKR4000400) - Walmart.com
Seagate Exos 7E10 4TB 3.5" HDD-T4000-ST4000NM000B Internal Enterprise Hard Drive
Seagate 4TB 2.5" SATA drives for 61% off by shucking externals