![Amazon.com: Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" -WD40EFPX : Electronics Amazon.com: Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" -WD40EFPX : Electronics](https://m.media-amazon.com/images/I/51vrbG4tlNL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" -WD40EFPX : Electronics
![Amazon.com: WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX : Electronics Amazon.com: WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX : Electronics](https://m.media-amazon.com/images/I/71n++WwxSnL._AC_UF894,1000_QL80_.jpg)
Amazon.com: WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX : Electronics
![Amazon.com: Seagate 4TB IronWolf NAS SATA Hard Drive 6Gb/s 256MB Cache 3.5-Inch Internal Hard Drive for NAS Servers, Personal Cloud Storage (ST4000VN008) : Electronics Amazon.com: Seagate 4TB IronWolf NAS SATA Hard Drive 6Gb/s 256MB Cache 3.5-Inch Internal Hard Drive for NAS Servers, Personal Cloud Storage (ST4000VN008) : Electronics](https://m.media-amazon.com/images/I/71JHA+9rL6L._AC_UF894,1000_QL80_.jpg)