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How to create a bootup/install disk/USB thumb drive OS X Mountain Lion

5652 Views 11 Replies Latest reply: Aug 31, 2012 9:35 AM by tal1971 RSS
tal1971 Level 2 Level 2 (245 points)
Currently Being Moderated
Aug 31, 2012 4:18 AM

I'm thinking of getting an iMac for my next computer, probably in 6 months or so.


From another post/question I have on the forums, someone mentioned that:


'New iMacs no longer come with install disks'


They went onto say that it should be possible to create a bootup/install disk and also create the same on a USB thumb drive.


Basically I wanting to know that in the worst case scenario of my iMac not booting up at all due to some software issue preventing it and I couldnt access the recovery partion. How would I be able to get my iMac up and running again if the iMac did not come with a bootup/install disk?


Also, I was wondering if anyone has created a bootup/install disk and or a USB thumb drive with a recently purchased iMac that has Mountain Lion installed (latest OS) and if so, could you provide me with instructions on how to do this please?



Thanks in advance

Windows Vista, iPad (3rd Gen) 32GB iPhone 4S 32GB
  • thomas_r. Level 7 Level 7 (26,935 points)

    All currently shipping Macs are able to boot into recovery mode over the internet if the recovery partition is missing for some reason (for example, if the hard drive fails).

  • thomas_r. Level 7 Level 7 (26,935 points)

    It will happen automatically if you try to enter recovery mode (by holding command-R) and the recovery partition cannot be found. Of course, you'll have to be prepared to download about 4 GB as part of the install.

  • stevenfrombrownsburg Level 2 Level 2 (340 points)

    In 6 months or so, it is almost assured that your iMac will come with Mountain Lion pre-installed (at Apple Stores, the on hand stock is already pre-loaded with ML), so it will cost you $19 to download a copy of ML.  Granted, it's not a huge, wallet busting purchase, so it's still quite doable.


    When the installer finishes downloading, it will automatically start.  Just cancel the installation (quit the installer).


    Then, all you need is a blank Double Layer DVD, or an 8GB flash drive.  Go here for easy, streamlined instructions and tools to create your boot disk.

  • VikingOSX Level 5 Level 5 (4,695 points)

    Follow the last paragraph in stevenfrombrownsburg post. The link takes you to a download for an application that is mash a button, get an answer simple to use and creates a bootable 8GB flash drive or even DVD. It assumes that the ML purchase and subsequent download lands in /Applications.


    I have used Lion Diskmaker and it works perfectly for this purpose.


    The caveat with that external bootable ML USB stick is that any install from the USB stick will erase your hard drive and perform a clean OS X install. You would want to first backup your home directory and third-party applications.

  • thomas_r. Level 7 Level 7 (26,935 points)

    So basically, I wouldnt be able to make my own bootup/install disk/USB thumb drive. I would need to purchase a copy of Mountain Lion from Apple for $19 or whatever the cost would be here in the UK


    That's certainly one option, if you are insistent on having a bootable installer. However, there is a way that you can create a bootable installer without purchasing a new copy of the system unnecessarily. Someone posted instructions here on doing that with Lion a while ago. Unfortunately, I've lost track of that post at this point, and don't remember the procedure. Perhaps someone else will chime in with the instructions.


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