Earlier quoted context omitted.
Applications on iOS aren't allowed to touch storage outside of their own data store or the photo roll. Some developers used to backdoor around this by passing data via the photo roll, but Apple started denying app approval for this a while back.
Some developers used to backdoor around this by passing data via the photo roll I've never heard of an app that did that. Can you name some?
[1] http://techcrunch.com/2010/02/02/apple-stanza-usb/
[2] http://stackoverflow.com/questions/220630/how-to-share-custo...