So how do you actually clean install Lion?

Discussion in 'Mac OS X Lion (10.7)' started by MrRoyksopp, Jul 20, 2011.

  1. MrRoyksopp macrumors regular

    Mar 4, 2010
    Hello Guys.
    There's been a lot of talking about, how to make a clean install of Lion.
    I've seen people using following methods:

    - After the download, you go in to "package content", find the ".dmg" file and then burn it into a disc. And then, boot it from the disc. I would say this is the normal way.

    - Make a clean install of SP and then install Lion on that clean install.

    - But recently, in a post on I saw, that you'll be able to run disc utility during the install? But how do you boot from that download?

    I'm a little unsure on how to do this, so my question is, how do you make it?
  2. fredsarran, Jul 20, 2011
    Last edited: Jul 20, 2011

    fredsarran macrumors 6502


    Jun 15, 2008
    I believe that when you run Lion installer after download, on Snow Leopard, it creates a Recovery Partition and put on it all files needed to install Lion. So when you use Disk Utility to erase the Main Partition (during the setup process), it will install Lion from the Recovery Partition.

    Creating a Lion disc or a Lion USB key, is mainly good if you have more than one Mac to install on and do not wish to re-download Lion every time.
  3. MrRoyksopp thread starter macrumors regular

    Mar 4, 2010
    Arh, I understand.
    So the only thing I have to do on my computer is, to download Lion -> Backup my system -> and then run the installer, where I choose to erase the harddrive?
  4. bluap84 macrumors 6502

    Feb 12, 2011
    im looking to do this also.
    i have time machine running, so would i just backup off that?

    its there anything which doesnt run on Lion? my main apps are:

    Adobe Creativesuite CS5

    This would give me a good chance to clean up my hard drive.
  5. Shadow%20Mac macrumors demi-god

    Dec 28, 2007

    There's an easier way to do a clean install

    1.) Back up all of your data

    2.) Preform the standard upgrade install from the MAS

    3.) The installation will create a recovery partition. After installing Lion, start up holding down the option key, and select "Recovery HD"

    4.) Use Disk Utility to Format the volume to a new HFS+ (Journaled), and then proceed to re-install lion.
  6. fredsarran macrumors 6502


    Jun 15, 2008
  7. pacmania1982 macrumors 6502a


    Nov 19, 2006
    Birmingham, UK
    I have Adobe CS 5 and can confirm it works fine. Also I use Skype but not the latest FUGLY version. I'm on 2.8(iirc) from

  8. MacBH928 macrumors 68030


    May 17, 2008
    Here is the question
    If I re-install Lion from the partition it created

    is the install file around or do I have to download the whole 4GB file, and after the download it will install?

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