MacOS – How to convert .dmg to Directory-folder

Some step by step instructions can be found here.

After opening Disk Utility:

1. Click the New Image icon
2. Place the contents of folder/directory into the newly created disk image.

You can use hdiutil to convert from .dmg to .iso directly:

$ hdiutil makehybrid -iso -joliet -o [filename].iso [filename].dmg

Renaming .cdr to .iso is bad advice! An .iso has a slightly different format that allows PC users to play the DVD as well. A renamed file will work on macOS, but NOT on a PC.

If you have a .cdr and want to convert it to an .iso, execute:

$ hdiutil makehybrid -iso -joliet -o [filename].iso [filename].cdr