![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.jpg)
Amazon.com: WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX : Electronics
![WD Red NAS Hard Drive WD40EFAX - Hard drive - 4 TB - internal - 3.5-inch - SATA 6Gb/s - 5400 rpm - buffer: 256 MB | Dell USA WD Red NAS Hard Drive WD40EFAX - Hard drive - 4 TB - internal - 3.5-inch - SATA 6Gb/s - 5400 rpm - buffer: 256 MB | Dell USA](https://snpi.dell.com/snp/images/products/large/en-us~AB133745/AB133745.jpg)
WD Red NAS Hard Drive WD40EFAX - Hard drive - 4 TB - internal - 3.5-inch - SATA 6Gb/s - 5400 rpm - buffer: 256 MB | Dell USA
![Amazon.com: Western Digital RE4 WD2003FYYS 2TB 64MB Cache SATA 3.0Gb/s 3.5" Enterprise Hard Drive - w/3 Year Warranty (Renewed) : Electronics Amazon.com: Western Digital RE4 WD2003FYYS 2TB 64MB Cache SATA 3.0Gb/s 3.5" Enterprise Hard Drive - w/3 Year Warranty (Renewed) : Electronics](https://m.media-amazon.com/images/I/61XuQyOBEzL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Western Digital RE4 WD2003FYYS 2TB 64MB Cache SATA 3.0Gb/s 3.5" Enterprise Hard Drive - w/3 Year Warranty (Renewed) : Electronics
Western Digital Red WD40EFAX 4 TB Hard Drive 3.5 Internal SATA SATA600 Storage System Device Supported 5400rpm 180 TB TBW 3 Year Warranty - Office Depot
![Amazon.com: Western Digital Red Pro 4TB 3.5-Inch 7200rpm 64MB Cache NAS Hard Drive (WD4002FFWX) : Electronics Amazon.com: Western Digital Red Pro 4TB 3.5-Inch 7200rpm 64MB Cache NAS Hard Drive (WD4002FFWX) : Electronics](https://m.media-amazon.com/images/I/51z-0u+2dTL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Western Digital Red Pro 4TB 3.5-Inch 7200rpm 64MB Cache NAS Hard Drive (WD4002FFWX) : Electronics
4 TB NAS and Nearline Drives Face-Off: The Contenders - WD Red Pro Review: 4 TB Drives for NAS Systems Benchmarked
![Western Digital Ultrastar DC HC310 HUS726T4TALA6L4 (0B35950) 4TB 7200RPM 256MB Cache SATA 6Gb/s 3.5" Data Western Digital Ultrastar DC HC310 HUS726T4TALA6L4 (0B35950) 4TB 7200RPM 256MB Cache SATA 6Gb/s 3.5" Data](https://cdn3.volusion.com/ovay6.hxgv9/v/vspfiles/photos/G01-1328-2.jpg?v-cache=1585840410)