OK - the drive is there, and is "A". In Windows Explorer I can see all the files. However, in ImgBurn, in any mode, all I can find in the source drop-down boxes are the two CD/DVD drives on this machine - as far as ImgBurn is concerned it doesn't see the USB floppy. Further suggestions?
It's now 1500 (GMT + 7) so I'm headed for home, but I'll check this first thing in the AM.