virtualbox.org

For those that do not have linux & cannot use my earlier command line, I am also attaching an image of a windows FAT formatted blank floppy

To create new floppy disk image on linux / ubuntu if your system does not have a floppy drive:

dd bs=512 count=2880 if=/dev/zero of=floppy.img

You will then need to mount it in virtual box and format it.