I use my fuze in MTP mode and I have an 8GB external microSD card. I wanted to create a “Podcasts” directory in the root of my external card, but whenever I disconnect the fuze and reconnect it, I find that the folder gets renamed to “New Folder”. The same thing occurs when I create playlists on the external card. I’ll create a playlist, e.g. “tunes.pla” and when I disconnect and reconnect the fuze, the playlist is now named “New Playlist.pla”.
Also, some folders that I copy into the external card, after disconnecting the fuze and reconnecting, get a bunch of number and letters prepended to the original folder name. For example, “The_Black_Keys-Attack_And_Release” becomes “0FB60000_The_Black_Keys-Attack_And_Re”.
I realize that I could just use MSC mode, but I like the benefits of using MTP. These are pretty minor annoyances, but it does seem like there are some differences in storing music on the external card than on the internal memory.
Also, after I installed Sansa Media Converted, I found that the file format protection was removed-- before I installed the software, I wasn’t able to upload some file types to the fuze (e.g. files that ended in .m3u). After I installed SMC, I no longer get any such errors (which I actually liked before, since it made sure only media files made it onto my fuze).