Why doesn't the EXE file fit on a floppy disk?

Download the dban-1.0.7_i386.exe file to your desktop and double-click it. This program will install DBAN to a floppy disk or USB flash device; it will not wipe the computer on which it is run.

You cannot install DBAN by copying or unpacking the EXE file to a blank floppy disk or other media.