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There is information on how to do the opposite (which is hard to impossible), but how do I make a writeable DMG readonly?
The reason that I might want to do this -- because otherwise this question is too short and will not meet superuser quality standards -- is that I am distributing a DMG and I don't want it altered TOO easily.
hdiutil convert /path/to/rwimage.dmg -format UDRO -o /path/to/readonlyimage.dmg
There are a number of other format options (with e.g. various kinds of compression); see the hdiutil man page for details.
-format UDZO) as the "default", so I'd go with that. There's no need to match the existing compression, especially since RW images aren't stored compressed.
Feb 17, 2012 at 15:22