Radio simply shows the files and folders in the order in which they physically exist on the file system. It unfortunately doesn’t do any sorting. There is a way around that, though. There are utilities which will physically re-order the filesystem on your USB key to specifically combat the lack of sorting on so many audio players. I use a utility called DriveSort: Anerty’s Lair – DriveSort Just copy all the files you want onto your flashdrive, then run DriveSort on it to re-order the files and folders in just about any way you want (including alphabetically).