Indeed using dd can be dangerous, but with floppies less so. The command would be:
Code:
dd if=drdflash.img of=/dev/fd0
where fd0 is your floppy drive, and 99% of the time, it is. Check anyway, but there's really no way it could be anything else. There also may be a floppy symlink in there like '/dev/floppy' you can use that instead if it exists.