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Don't have a mac in front of me, but have you ruled out the possibility that the function is built into Disk Utility?
This thread includes a tip about a terminal command, as well as how to play via DVD player.
Also, FYI, in case all you're trying to do is view a movie-- VLC will play it directly.
Disk Utility, might be something of a "restore" function.
Here are other methods/resources:
https://www.google.com/search?aq=f&sourceid=chrome&ie=UTF-8...
https://www.google.com/search?sourceid=chrome&ie=UTF-8&q=ma...
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