AmigaOS3.0 (as standard with the A1200) comes with drivers for 720k (1440 if you'd have a HD-drive) PC floppies.
It's named "PC0:" and should be on the "Storage" disk of the 3.0 (or 3.1) floppy-set..
If you don't have these disk, you'll need to get them for installing an HD anyway.