Amazon.com: Seagate IronWolf 4TB NAS Internal Hard Drive CMR 3.5 Inch SATA 6Gb/s 5400 RPM 64MB Cache for RAID Network Attached Storage Rescue Services (ST4000VNZ06/006) : Electronics
Seagate IronWolf ST4000VN008 4 TB Internal Hard Drive
Seagate 4TB IronWolf NAS SATA Hard Drive 6Gb/s 256MB Cache 3.5-Inch Internal Hard Drive for NAS Servers, Personal Cloud Storage (ST4000VN008), Silver (ST4000VN008) - Newegg.com
new Seagate ST4000VN008 4TB IronWolf 3.5" SATA3 NAS Hard Drive 763649110560 | eBay