"Replaces the system default DMG mounting application; is better in every way."
- Some Guy on the Internet
FastDMG is a free macOS utility to mount
.dmg and other disk images quickly, without any unneeded nonsense. It is a very fast and reliable alternative to Apple's annoying DiskImageMounter. And yes, that icon is a reference to After Dark's Flying Toasters screensaver on Classic MacOS.
FastDMG is actually a minimal wrapper around the
hdiutil command line tool that ships with macOS and therefore uses Apple's private DiskImages framework indirectly.
I've personally used FastDMG for many years and it works really well. It's solid, free, open source software and has a home on GitHub. If you like it, feel free to make a donation.
.dmgfile in the Finder and press Cmd-I to show the Get Info window
FastDMG will then take care of mounting
.dmg disk images when they're opened in the Finder. You can do the same for
.toast and any other disk images supported by FastDMG.