I'm not sure you can from MB's end, at least not without an app on the other end to help the process. I have a new phone that's not rooted, and I've spent hours trying to get Windows to treat it as a drive. With a combination of apps and desktop programs I was able to get it connected by ftp or webdav, but whenever mb tried to scan it, it took AGES. I gave up when my computer blue-screened during one scan, something it has never done in four years.