The ability to create 400KB disks is a system software feature, of course. Apple's floppy drive always supported GCR 800KB disks so it can do 400KB disks.
If you don't have a Mac that runs System 7.5.x -- the safe max for dealing with 400KB floppies -- you can try making later system software behave like System 7.5.x. Boot to a minimum system or turn off PC Exchange and the like. When I tried it five years ago, I was able to write 400KB disk images to media (in spite of error messages) but I was unsuccessful beyond that (eg mounting disk images in the Finder).
If you don't have a Mac that runs System 7.5.x -- the safe max for dealing with 400KB floppies -- you can try making later system software behave like System 7.5.x. Boot to a minimum system or turn off PC Exchange and the like. When I tried it five years ago, I was able to write 400KB disk images to media (in spite of error messages) but I was unsuccessful beyond that (eg mounting disk images in the Finder).