Something I stumbled upon today, an application called USB drive. From the site: Please Register or Log in to view images I tested it and it seems to work great, simple to use if you read the help page. Its currently in beta and the current version will expire on the 1st of November this year. To download, add this source in cydia http://apt.dmytro.me I must stress that it is in beta so use it at your own risk, it worked for me perfectly though. A video tutorial is here, its in french but you get the idea on what to do.