Amiga floppy drives can be connected to the PC using a Catweasel floppy controller. Images can then be written to the floppy using your PC. I've never used one personally, though.
Actually, the Catweasel is a custom controller, not an Amiga floppy -> PC adaptor. The Catweasel needs a standard PC floppy drive, not an Amiga floppy drive. (Apparently some people mis-understand and hook Amiga floppy drives to it... That won't work. Just use a $1 cheap standard floppy drive.) And it does, indeed enable reading and writing to Amiga disks.
