Given the possible issues I think you mean you want a shared place for a COPY rather than a place for your files to go to die.
I've lost count of folk that reduce their copies to one place and one drive and then come to the forums to ask how to get it all back. Don't repeat their lessons.
OK, for me it was a simple matter to put some USB HDD on my WNR3800 router. That was about 60 bucks and I was done.
I would like to place all my docs/music/videos on my external and have it accessible through my home network so I can access my docs etc with other pcs on the hetwork.