I tried a couple of different hubs with my Oppo before I got one that worked. The one that ended up working was a cheap non-powered hub that I use with three 2TB external HDDs. Don't know why one works and another doesn't, but I used one of those that didn't work with the Oppo on my pc and it has worked fine.
I'm using powered HDDs so I can get by with a non-powered hub.
Edited by scolumbo - 3/2/13 at 2:21pm