Windows xp image in one floppy?

hi there,
just a foolish Question , is it possiable to have the image of Windows xp into one floppy?
I am asking because , a guy came to our company last day to format pc , other then putting the windows xp bootable cd , he put a single floppy and it formated the pc and installed windows xp in its orginial opsition in some min.

how is it possiable? please help