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 (B01LOOJBQY) | Amazon price tracker / tracking, Amazon price history
Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 64 MB Cache, 3.5" - WD40PURZ (B071KVB4F8) | Amazon price tracker / tracking, Amazon price history charts, Amazon
Amazon.com: Seagate BarraCuda 4TB Internal Hard Drive HDD – 3.5 Inch Sata 6 Gb/s 5400 RPM 256MB Cache For Computer Desktop PC – Frustration Free Packaging ST4000DMZ04/DM004 : Electronics
Amazon.com: Seagate Barracuda XT ST4000DX000 4 TB Hard Drive - SATA [SATA/600] - 3.5 Drive - Internal : Electronics