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Easily convert DMG images to ISO

March 28th, 2007 - How to, Mac OS X, Tips & Tricks

If you’ve ever wanted to turn a DMG file into an ISO file, look no further. Perhaps your Mac doesn’t have a writable media drive, or it’s not up to speed, or the multitude of other reasons you’d want to burn an ISO from a PC rather than a DMG on your Mac. Forget downloading the shareware apps that promise to convert DMG files to ISO, you can do it right from Mac OS X’s command line, for free, using the hdiutil command.

hdiutil convert imagefile.dmg -format UDTO -o imagefile.iso

This will actually create a file called imagefile.iso.cdr in the current directory, but you’ll want to change that to just .iso, so type:
mv imagefile.iso.cdr imagefile.iso
That’s all there is to it, now your DMG image file can be burned on any PC with the proper hardware.

Posted by: Editor

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Comments:

Comments: 9

Comment from anon
Time: March 28, 2007, 2:16 pm

just burn it on your mac, every new mac comes with a burner anyway

you can burn iso on mac too

Comment from phummers
Time: March 28, 2007, 3:37 pm

@anon:
“just burn it on your mac, every new mac comes with a burner anyway”

What percentage of Mac users do you think have new Macs?

Comment from Frank
Time: March 29, 2007, 8:55 am

@anon, not all new macs have an dvd burner, and not all dvd burners have dual layer

Comment from yopy
Time: October 30, 2007, 12:12 pm

Does that work with a boot mac CD?

Comment from Ben
Time: May 8, 2009, 5:14 pm

Awesome. This worked perfectly on MacOS 10.5 to convert a dmg to an ISO that would mount with Virtualbox. Great tip. Burning to DVD and then using that would have been a waste.

Comment from Ben
Time: May 8, 2009, 5:14 pm

Awesome. This worked perfectly on MacOS 10.5 to convert a dmg to an ISO that would mount with Virtualbox. Great tip. Burning to DVD and then using that would have been a waste.

Comment from rou
Time: September 25, 2009, 2:58 pm

This didn’t work when trying to c onvert a 8gig DVD-dl image. Said “hdiutil: convert failed – image/device is too large”

Comment from Dan
Time: October 4, 2009, 1:29 pm

I have a copy of Snow Leopard 10.6 but cannot burn it on my iMac since I have no DVD DL burner for starters.
With my WIN XP I tried burning the dmg file with the software TransMac. Doesn´t seem to work though cus my mac just tries to read the disc for then to finally spit it out.

I always use Verbatim DVD DL so the media is not the faulty one

—–
While I was typing this message I tried renaming my uncompressed dmg file to iso and burn it with Nero.
So now I just tried it on my mac and it works!
…but I couldn´t run the install , the message said “cannot be installed on this machine”.
Perhaps cus I only have 256 MB in it and it requires 2GB.
I´ll have to buy more and then I hope it works

Comment from Amorim
Time: January 1, 2010, 4:54 pm

Great Idea… work fine to me.

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March 28th, 2007