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Author Topic: (Solved) how to convert a dmg file to iso  (Read 527 times)

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Offline penrose1950

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(Solved) how to convert a dmg file to iso
« on: July 26, 2017, 05:16:31 am »
hello my apple mac mini 2014 is not working and all i see is a circle with a line through it,i have downloaded a mac osx dmg file to my laptop using peppermint and i need to convert it to a iso file,so i can try and restore my mac and i have tried all the keyboard roots with no luck,does anyone know of a way of doing this please?
thank you.
« Last Edit: July 26, 2017, 11:27:56 am by penrose1950 »

Offline PCNetSpec

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Re: how to convert a dmg file to iso
« Reply #1 on: July 26, 2017, 07:59:21 am »
Can't be done.
(if you read the first link below you'll see why .. the OS X installation DMG is a weird hybrid image with 2 distinct partitions)

But it IS possible to extract the DMG to a partition on the hard drive (using Linux) .. then install OS X from that partition.
(or use that partition to boot into the Disk Utility and create an OS X USB installation media from your DMG)

In best Blue Peter fashion "here's one I made earlier" .. See here:
https://linuxforums.org.uk/index.php?topic=1072.0

Proof it works:
https://askubuntu.com/questions/182728/reinstalling-mac-os-on-ubuntu-imac

Info showing a slight modification was needed for OS X >= Lion
https://ubuntuforums.org/archive/index.php/t-1969841.html

Your only other option would be to check out Ebay for an OS X DVD or USB .. which BTW are quite cheap .. for example
http://www.ebay.co.uk/itm/Mac-OS-X-10-12-Sierra-A-Bootable-DVD-for-Fresh-Install-Repair-or-Recovery-/222530452855
or
http://www.ebay.co.uk/itm/Mac-Os-X-Sierra-10-12-5-Bootable-USB-Recovery-Upgrade-Fresh-Installation-/182582988719
« Last Edit: July 26, 2017, 08:53:16 am by PCNetSpec »
WARNING: You are logged into reality as 'root' .. logging in as 'insane' is the only safe option.

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Offline penrose1950

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Re: how to convert a dmg file to iso
« Reply #2 on: July 26, 2017, 11:26:40 am »
Hello I found a wired keyboard in the loft this morning and did cmd r and then chatted to Apple who said it wasn't  finding the startup disk and so I erased the hard drive and reinstalled Sierra again, thank you for all your help.

Offline penrose1950

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Re: (Solved) how to convert a dmg file to iso
« Reply #3 on: July 26, 2017, 11:28:33 am »
Thank you for your help.