How to install a fresh, clean OS X Lion GM on your mac?

Discussion in 'Mac OS X Lion (10.7)' started by 212rikanmofo, Jul 1, 2011.

  1. 212rikanmofo macrumors 65816

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    Jan 31, 2003
    #1
    I've downloaded the Mac OS X Lion GM Seed from the Mac appstore, where does it store the actual downloaded dmg file? Does anyone on here know if theres a hack or a way to burn it on a dvd disc or put it on a usb drive to install from? I'd like to format the HD on my macbook pro and install a brand new, fresh copy rather than updating from SL -> Lion.
     
  2. Nielsenius macrumors 6502a

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    Apr 16, 2011
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    Virginia
    #2
    I don't think any "hack" is needed. Just find the .dmg file (Spotlight) and use Disk Utility to burn it to a DVD. You shouldn't have any problem booting your computer from the DVD. I did this for DP 2. It installed no problem. All this talk about it being stupid that Lion won't be released on a disk is overblown. You can make your own disk.
     
  3. Kahnyl macrumors 68000

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    Feb 2, 2009
    #3
    Even just creating a small partition on an external drive and restoring the image to that worked for me. Much better than going out and buying a disk or waiting for it to arrive.
     
  4. jayhawk11 macrumors 6502a

    jayhawk11

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    Oct 19, 2007
    #4
    Why is this so hard to understand? Lion installs a recovery partition as part of the install process. Use that recovery partition's Disk Utility to format the drive. Install.

    It's not that difficult. :confused:
     
  5. 212rikanmofo thread starter macrumors 65816

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    #5
    How does it work? There is no .dmg filed that was downloaded from the mac app store? It's a 3.76gb application file. How would I make an application file bootable?
     
  6. jayhawk11 macrumors 6502a

    jayhawk11

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    Oct 19, 2007
    #6
    Launch the Application. It will create the recovery partition as part of the install process, then reboot into that recovery partition.
     
  7. balamw Moderator

    balamw

    Staff Member

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    #7
    An app is just a bundle. You can generally right click and "Show Package Contents" to find the contents (in this case the DMG).

    B
     
  8. 212rikanmofo, Jul 1, 2011
    Last edited: Jul 1, 2011

    212rikanmofo thread starter macrumors 65816

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    Jan 31, 2003
    #8
    Okay so would it be possible to somehow put the 3.76gb "app" file onto a USB Drive and install Lion onto a clean partition from there?

    If so how do I go about putting the installable Lion image onto the USB drive? Some help is greatly appreciated. Thanks.

    UPDATE: I found the .dmg file inside of the app. it is called InstallESD.dmg (3.74gb), I am attempting to restore this image file onto my 8GB USB Flash Drive and see if I can boot up from it in order to install Lion onto a fresh new partition. I hope it works.
     
  9. jayhawk11 macrumors 6502a

    jayhawk11

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    Oct 19, 2007
    #9
    Stop thinking.

    1) Launch the application.
    2) It will put a recovery partition on your Hard Drive.
    3) It reboots into that recovery partition.
    4) Use said recovery partition to wipe your drive.
    5) Voila. Clean install.
     
  10. FPSDavid, Jul 1, 2011
    Last edited: Jul 1, 2011

    FPSDavid macrumors regular

    FPSDavid

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    Jun 23, 2010
    #10
    Will this work for 100% sure? I got into the recovery partition, tried to click Install OS X Lion or whatever the one below restore from Time Machine was, it said verifying with Apple, then errored and went back to the menu with the 4-5 options.

    I don't want to wipe my drive and then not be able to go back to Snow Leopard if the verification from Apple fails...
     
  11. 212rikanmofo thread starter macrumors 65816

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    #11
    ^ +1 Can someone please verify if this will work.
     
  12. Kahnyl macrumors 68000

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    Feb 2, 2009
    #12
    The last time I did it (a few weeks ago) it didn't work like that. When I clicked Install it worked a little, rebooted, and continued with the install. Between clicking Install and Setup Assistant there was no chance for user interaction. I wasn't given any opportunity to use Disk Utility.

    A few weeks before that I tried using the recovery partition on an install of Lion DP to do a clean reinstall. I got error messages and couldn't proceed. It's likely that this is fixed in the GM but you'd have to update to the GM first to try it.

    Consistantly the least painful way to do it over the last few months has been restoring the DMG to an external disk.
     
  13. nanosour macrumors member

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    Dec 14, 2009
    #13
    Use Disk Utility to create a partition for Lion. (8GB minimum). THen, what you want to do is launch Disk Utility and under File on menu select Open Disk Image. Open your .dmg that you downloaded from app store. This will add the dmg to the left side of Disk Utility. Right click on the .dmg and select burn to disk option. Put it on a 4.7 GB DVD. Then remove and re-enter the DVD from the hard drive.

    Then simply restart your computer. At the first audible sound, press and hold the option key until the partitions and Lion DVD show up. Select the Lion disk and make sure you install it on the partition you made for lion. Then each time you boot you'll need to hold the option key down to be able to select with system you want to boot in to.
     
  14. Yamcha macrumors 68000

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  15. Kahnyl macrumors 68000

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  16. 212rikanmofo thread starter macrumors 65816

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    #16
    Yamcha thats what I thought as well. But right click the app file and go to show contents and do a search for dmg and you will see it.
     
  17. Yamcha macrumors 68000

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    Mar 6, 2008
    #17
    Oh Found it :] Thanks
     
  18. FPSDavid macrumors regular

    FPSDavid

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    #18
    I ended burning the DMG to a Image DVD and booted from it, install went smoothly.
     
  19. Tucom macrumors 65816

    Tucom

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    Jul 29, 2006
    #19
    Did restoring the .DMG to the flash drive work too?
     
  20. truciet macrumors 6502

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    Jun 16, 2008
    #20
    i can vouch you can copy the dmg out of the package and use the disk utility to restore the image to a flash drive.

    you will need at least 8gb. 4gb will not work.

    it took me 10-12 minutes to make the usb drive copy.

    once it finished, i rebooted holding down the option key and started the usb up. lion installed smoothly and 100% clean. once installation was completed, i rebooted again holding the option key and confirmed the recovery partition.

    everything went as planned and 100% clean install!
     
  21. tom vilsack macrumors 68000

    tom vilsack

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    #21
    so even doing a clean install from dvd or usb...lion makes recovery partition?
     
  22. vivid-mist macrumors newbie

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    #22
    Would also like to know :)
     
  23. Kahnyl macrumors 68000

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    Feb 2, 2009
    #23
    It always makes it. It's not just for use during the initial install.
     
  24. ryguy120 macrumors newbie

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    Jul 19, 2010
    #24
    What are the advantages of a clean install vs. just updating over Snow Leopard?
     
  25. MacBookPro13" macrumors 6502a

    MacBookPro13"

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    #25
    I couldn't find an option for disk utility so I just did a clean install of Snow Leopard 10.6.7 from my DVD and then installed Lion GM over that.
     

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