i have used western digital, hitachi, seagate and maxtor 1tb drives and all work fine in wbfs format.
http://www.ebuyer.com/product/174844
http://www.ebuyer.com/product/179773
http://www.ebuyer.com/product/160904
All were formatted with EASEUS partition master and then wii backup manager...
just wondering if anyone has made a etch a sketch game using the balance board, ive seen they were planning on making it into a game but it looks like it was canceled