Mountain Lion Clean Install.

Discussion in 'MacBook Pro' started by Adamantoise, Dec 18, 2012.

  1. Adamantoise macrumors 6502a

    Joined:
    Aug 1, 2011
    #1
    Finally bought my 15.4" Macbook Pro ... Have a blank SSD and would like to put mountain lion on it.

    I have searched the internet but all I see are guides for people that 'bought' the upgrade and thus have access to mountain lion as a download in the App Store.

    Any help will be appreciated.
     
  2. plasticphyte macrumors 6502

    Joined:
    Nov 9, 2009
    #2
    Get an 8GB or larger flash drive or external USB drive, ensure there is nothing valuable on it, and that it has been formatted with the Mac OS file system. You will also need to have the computer connected to the Internet.

    If you haven't already accepted the iLife apps into your iTunes account, do this first, otherwise you won't have them available for installation after you install the OS on your new drive. Google will help you figure out how to do this.

    With your old hard drive in the laptop, boot into the recovery partition by holding the ALT key down, then selecting the recovery partition option.

    When you have booted into the recovery environment, select the appropriate language.

    At this point you should have an option to reinstall Mac OS, choose it, and when asked where to install it to, choose the external drive.
    The process will download the Mountain Lion installer to the external drive - it is usually the version of the OS that shipped with your computer.

    It will reboot when it is done, this is the point you need to remove the external drive from your Mac.

    From there you can follow the any guides online that walk you through creating a Mac OS installer USB stick.
     
  3. Adamantoise thread starter macrumors 6502a

    Joined:
    Aug 1, 2011
  4. Adamantoise thread starter macrumors 6502a

    Joined:
    Aug 1, 2011
    #5
    Thanks! It's just that most of those guides were made for people who bought the Mountain Lion upgrade from the App Store and had access to the .dmg ... My computer came preinstalled with Mountain Lion, I had no idea about the Internet recovery option.
     
  5. Orlandoech macrumors 68040

    Orlandoech

    Joined:
    Jun 2, 2011
    Location:
    Salt Lake City, UT
    #6
  6. Adamantoise thread starter macrumors 6502a

    Joined:
    Aug 1, 2011
    #7
    So let me get this straight ... Pretty much all this does is installs Mountain Lion onto the SD card and then from there I have to do the whole internet recovery thing again on the SSD?

    Because I followed your instructions and right now I have an SD card that can boot Mountain Lion (not the installer, Mountain Lion is installed on the SD card itself, I can run Mountain Lion from the SD card, it even has it's own little recovery partition on the SD card).

    So there's really no way to just get a raw install disc? I have to remove the HDD, put in the SSD and use the recovery partition on the SD card to install Mountain Lion (via internet recovery @_@)?
     
  7. T5BRICK macrumors 604

    T5BRICK

    Joined:
    Aug 3, 2006
    Location:
    Oregon
    #8
    Is there a reason you can't just use Internet recovery?
     
  8. Adamantoise thread starter macrumors 6502a

    Joined:
    Aug 1, 2011
    #9
    Well, I'm lagging on League of Legends since I'm playing while it's doing its thing.

    Guess I'll just wait it out.
     
  9. T5BRICK macrumors 604

    T5BRICK

    Joined:
    Aug 3, 2006
    Location:
    Oregon
    #10
    Oh. Yeah, the fact that you have to download 4GB every time you want to reinstall the OS is kind of annoying.
     
  10. minifridge1138 macrumors 6502a

    Joined:
    Jun 26, 2010
    #11
    Yes, I hate that the Installer is really a downloader.

    If you already have Lion installed, you could clone that partition onto your SSD.
     
  11. plasticphyte macrumors 6502

    Joined:
    Nov 9, 2009
    #12
    My apologies for not replying earlier, I don't visit the forums here very often any more.

    Firstly, I'm bolding part of my original post, it seems you may have missed this step, resulting in a copy of Mac OS X being installed on the SD card, and I didn't clarify that failing to remove the card/USB stick/drive would end up with the installation process proceeding on the stick/drive.

    You will need to repeat the process to get the InstallESD.dmg file needed to create a bootable USB installer.


     
  12. duervo macrumors 68000

    duervo

    Joined:
    Feb 5, 2011
    #13
    Just adding my nod to using Internet Recovery. It worked fine for me a couple weeks ago when I replaced the stock mechanical drive in my new mid2012 MBP 13" with an SSD.

    Pretty painless ... Just need to be aware that it will take a while because it's downloading a lot of data over your Internet connection. Start it, then check on it every few minutes to see how it's doing.
     

Share This Page