Right, so this is not a sysadmin post by any means BUT, I still faced some technical difficulties while setting up some features on my new V-Drums set so I figured posts on these things could find a place on a tech blog :)
I am now (finally!) a very happy owner of a Roland TD-11K, but I think this post should apply even if you have a TD-11KV or perhaps even a TD-15K. I had some issues trying to get it to recognize my USB drive so I could play along with my songs or record myself, and this is what I found out about how this drums set works when it comes to USB drives.
This is all you need to make your Roland TD-11K V-Drums Set recognize your USB pendrive.