Secondary drive attached to My book World not recognized

I have a My Book World Edition (white light), with a secondary WD 3 TB hard drive attached to the MBWE USP port on the back.  the My Book World Edition is recognized by Finder, but unfortunately there is no display for the secondary 3 TB hard drive in finder.  Running Mac OX 10.6.8.   I thought that you could plug an additiional USB hard drive into the MBWE and have it recognized automatically - help is much appreciated!

I believe you can not connect a drive larger than the MBW through USB

this might be the reason why the other drive does not appear

try going to the net admin an formatting the external drive //mybookworld

it will show under advance mode > storage > usb shares