I have a mix CD I made myself years ago that I would like to transfer to a USB drive. The tracks from the CD have already been ripped to my computer using Windows Media Player, but I'm not sure whether I used the right format. In order for the songs to play continuously when the flash drive is plugged into another computer, do they need to be ripped as WMA, MP3 or WAV files? What else do I need to know in order to have the 18 tracks play in the correct order one after the other? I'm a complete novice at this.