Western Digital already bumped its My Book Studio Edition II hard drive to 4TB earlier this month, and now the company is doing the same for its networked storage line. The My Book World Edition II NAS is based on two Caviar Green drives in 1TB or 2TB sizes, for a total of 2TB or 4TB respectively, which can be configured in a mirrored RAID 1 array for an extra level of protection or RAID 0 if capacity and speed over redundancy is required.

As one would expect, the drive attaches to home networks using a Gigabit Ethernet connection, and is compatible with both PC and Mac systems. Bundled with automatic backup software and streaming media utilities, the new and improved My Book World Edition II can act as an iTunes server or a DLNA-compatible device, streaming content to Xbox 360 or PlayStation 3 consoles and some digital TVs. Users can also securely access their files from anywhere in the world using the free MioNet remote access service included.

It’s not as robust and feature-rich as the Synology Disk Station DS-409+ NAS, which we recently reviewed, but then again WD is targeting home users here rather than small-and-medium businesses. As such, it also comes with more affordable price tags of $400 for a 2TB version and $700 for the 4TB one.