WD Red 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD40EFRX
Specifically designed for use in NAS systems with up to 8 bays
Supports up to 180 TB/yr workload rate
NASware technology for compatibility
Small and home office NAS systems in a 24x7 environment