That USB connection is not for hard-drive or printer sharing, looks like it's to backup settings.
You need something like this to use with another hard-drive http://www.newegg.com/Product/Product.aspx?Item=N82E16822155019
Of a router like this to use with your USB drive http://www.newegg.com/Product/Product.aspx?Item=N82E16833122326
The NAS part in that router means it has network attached storage capability. Other routers have this, I like the Netgear RangeMax ones.