The popularity of Network-Attached Storage (NAS) devices is rapidly ramping up in both small businesses and homes, fueled by their usefulness and their increasing affordability. This surge in interest has led Western Digital to add a new family of hard disk drives - the WD Red family of NAS hard disk drives, even as Seagate drops production of 5,400 RPM desktop hard disk drives.

Of course, this begs the question - why choose a WD Red when the WD Green (formerly known as the WD Caviar Green) hard disk drive is also a low-powered, slower-spinning hard disk drive? It mainly lies in the WD NASware firmware, its comprehensive compatibility testing with common NAS systems and a dedicated WD Red 24x7 support line.

Today, we are going to take a look at the latest addition to Western Digital's family of Red drives - the WD40EFRX with 4 TB of storage capacity.