Create Floppy Disk Image (MacOS)

Appendix B: Creating Floppy Disk Image Files (MacOS)

Creating Floppy Disk Images

Create a 1.44MB 3.5” floppy image

dd if=/dev/zero bs=512 count=2880 of=floppy.img

Create a 720KB 3.5” floppy image

dd if=/dev/zero bs=512 count=1440 of=floppy.img

This diskette can be formatted in the guest operating system or on your Mac and files can be copied to it and removed from it once it’s mounted. To mount it, open Disk Utility

File, Open Disk Image, Select the file you created above.

Add or remove files to/from the floppy disk image using the Finder. 

When finished just Eject it like any normal removable drive in the Finder.

Note: the name of the floppy image is the name of the disk volume from when the floppy image was created. If you want to change this you’ll need to reformat the drive (which will delete all data so back it up first!). 

Formatting the diskette image from the DOS prompt:

\DOS\FORMAT A: /V:VOLNAME

 where VOLNAME is the name of the floppy when mounted and is displayed when listing files on it using the DIR command..