There's nothing wrong with your N9. The only partition visible through USB (when you don't use developer tools such as the SDK or flasher) is MyDocs (seen by the Harmattan OS as /dev/mmcblk0p1). Also, it's the only one formatted with the FAT32 file system, so any OS can access it (Windows can't read EXT4 for example). If you wanted, you could play a game () with /etc/mtab, mount and umount, but one would have to suggest treading a wary path in this case.