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Alek Richter
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Enlightened
Asked: 2021-11-03T06:52:42+00:00

How can I convert a DMG to ISO on Mac OS X (preferably for free)?

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I have medical records within Windows software within a DMG disk image. How can I convert the DMG to an ISO format on Mac OS X? Is it possible to do it within Disk Utility or CLI easily, or do I need an external utility?

1 Answer

  2. Enlightened

    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

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