Installing OS X from .dmg onto a partition.

Discussion in 'Mac Basics and Help' started by nathanl1192, Feb 25, 2011.

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  1. nathanl1192 macrumors member

    Joined:
    Oct 13, 2010
    #1
    I have Mac OS X 10.7 in a .dmg file, and would like to install it onto a partition. I have made the partition, but do not know how to install OS X onto it off a .dmg.

    Help please!

    Thanks!
     
  2. paddyhazard macrumors regular

    Joined:
    Jan 27, 2010
    Location:
    London
    #2
    Click on the install dmg and when it asks which volume you'd like to install it on, select the partition.

    Simples.
     
  3. sim667 macrumors 65816

    Joined:
    Dec 7, 2010
    #3
    Hang on, does he want to install 10.7 on the partition, or does he want to use the partition as the boot disk with 10.7 on it, to upgrade his 10.6 disk?
     
  4. nathanl1192 thread starter macrumors member

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    Oct 13, 2010
    #4
    I want to keep my current version of 10.6 and all my files intact, but do a clean install of 10.7 onto the partition. I would like to be able to choose which one to boot to. 10.7 is for testing and development, 10.6 for home use.
     
  5. Cougarcat macrumors 604

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    Sep 19, 2003
    #5
    I just did this. It's easy. Just make 2 partitions on your external, one smaller one for the installer and a larger one for the actual install. Click the restore tab for the installer partition, drag the DMG over to source and the installer partition to destination. Click Restore. When that's done, go to the installer partition in the finder and load the installer. Choose your new larger partition for the install.

    When it's done installing, press option on startup to choose what to boot.
     
  6. nathanl1192 thread starter macrumors member

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    Oct 13, 2010
    #6
    How big should they be? Is 5GB enough for the installer, and 35GB for the actual install... im not going to be bundling it with files...
     
  7. Cougarcat macrumors 604

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    Sep 19, 2003
    #7
    Yes, 35 GB is more than enough. You could probably get away with eight if you really weren't going to add any files. For the installer, all you need is the same size or greater of the dmg...4 GB or so, I think.
     
  8. paddyhazard macrumors regular

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    Jan 27, 2010
    Location:
    London
    #8
    YOu don't need to create a separate partition for the installer. Once it's downloaded from the app store, you click on in and it launches as if you've added a disk. From there you select the partition you want to install it to and press go (The button isn't actually called go, i think it's install or something).
     
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