How to create a lion boot disk

Discussion in 'Mac OS X Lion (10.7)' started by vomer, Jun 7, 2011.

  1. macrumors member

    Sep 13, 2007
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)

    Here we go:

    [ Lion Boot Disk ]
    Purchase and download Lion from the Mac App Store on any Lion compatible Mac running Snow Leopard.

    Right click on “Mac OS X Lion” installer and choose the option to “Show Package Contents.”

    Inside the Contents folder that appears you will find a SharedSupport folder and inside the SharedSupport folder you will find the “InstallESD.dmg.” This is the Lion boot disc image we have all been waiting for.

    Copy “InstallESD.dmg” to another folder like the Desktop.

    Launch Disk Utility and click the burn button.

    Select the copied “InstallESD.dmg” as the image to burn, insert a standard sized 4.7 GB DVD, and wait for your new Lion Boot Disc.
  2. macrumors regular

    Feb 28, 2011
    Shanghai, China
    And is it possible (and how) to make a clean install from that boot disk or from a "restored" dmg image?
    Thanks a lot!
  3. macrumors 6502a


    Sep 15, 2010
    the woods
    Exactly, is it possible to install Lion without having any OS installed?
  4. macrumors newbie

    Oct 27, 2009
    I 2nd that, or is it 3rd.

    Pure speculation on my part, but maybe you can purchase a DVD at or cost, or even some kind of boot disk to download the installation on the fly. Much like Linux has done for years...

    Would be nice to have some official word regarding this from God himself. WWDC raised a few questions in my mind regarding Office/Enterprise distribution.
  5. macrumors regular

    Apr 6, 2006
    it is possible to clean install with a burned disc of DP4... i did it on 2 machines. so i'd hope they'll leave that in for the final version as well.
  6. macrumors Nehalem


    Feb 19, 2005
    If you can make a bootable DVD then it's good. I've made a backup bootable DVD of snow leopard, even made a bootable flash drive for a hackintosh. If Lion somehow prevents this then buying a new HDD or in my case a new SSD would seem impossible if I wanted my OS on it.
  7. macrumors 6502a


    Sep 15, 2010
    the woods
    I can confirm from my fresh Lion install that this is possible. I used this guide but it might as well work out of the box...
  8. macrumors newbie

    Mar 7, 2008
    I tried following this but the DVD's that I created were not bootable. What am I doing wrong?

  9. macrumors 68040


    Aug 6, 2007
    Are you sure you burned this a an "Image" and not just burned the dmg to the dvd?
  10. macrumors 6502a


    Jan 25, 2010
    I open package contents on the installer but I cannot find the folder you specify... Where exactly is it? Am I clicking the wrong thing?
  11. macrumors newbie

    Feb 16, 2008
    my steps was

    1) make new partition for a Lion
    2) inside SL, install the lion from InstallESD.dmg
    3) back to SL copy InstallESD.dmg to my external hard
    4) backup my files from SL
    5) inside Lion, Erase SL partition "Optional"
    6) resize the Old partition to Lion

    now everything works fine with me
  12. macrumors newbie

    Mar 7, 2008
    Yes, because the DVD does not contain the DMG but the folders inside the DMG

  13. macrumors 6502


    Oct 12, 2008
    Sydney, Australia
  14. macrumors 6502a

    Jun 9, 2004
    London ish
    That's a very good question.
  15. macrumors 6502a


    Jan 25, 2010
    Yep, I have an Air so had to do it this way.

    Once you have the .dmg (However you obtained it)

    Open disk utility and click your USB.

    This is mine, I have 2 partitions on my 320GB External HDD, works the same on a USB though.

    Click your partition, not the overhead name of the drive.
    In this case I would select "Other" or the "Install ESD" (Although that is my current 10.7 installer)

    Go to restore and select the 10.7 dmg as your source, the partition as the destination. Done.

  16. macrumors regular

    May 27, 2009
  17. macrumors regular

    Jan 27, 2007
  18. macrumors 6502a

    Jun 9, 2004
    London ish
    Looks like this is not so much of an issue any more, since Apple just announced today that from August you will be able to buy Lion on a USB stick for something like $69? :)
  19. macrumors newbie

    Jul 20, 2011
    How about AFTER you install Lion?

    How do I create a boot disk if I realized I wanted one AFTER I upgraded to Lion? I tried re-downloading the installer from app store and it will not let me.
  20. macrumors 6502a

    May 2, 2007
    I'm in the same boat. I didn't realize the installer would be deleted after upgrading.:(
  21. macrumors newbie

    May 17, 2011
  22. macrumors member

    May 28, 2010
    Yes, the installer gets deleted after the installation. I used Time Machine to backup my whole system right before I installed Lion and also copy the installation package to a USB.

    Once you finished downloading Lion, it should appear in your Applications folder.

    Make sure you backup the installation package before you install or else you won't have a chance to back up it later.
  23. macrumors 68000


    Aug 4, 2008
  24. macrumors regular

    Jan 27, 2007
    So basically if you didn't back it up before installing it you've got no chance of doing a clean install at a later date?

    Not impressed about this.
  25. macrumors newbie

    Jun 5, 2011
    Folsom, Ca
    If I had to guess, it disappears the installer data into another partition

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