Trying to erase all date

Discussion in 'Mac OS X Lion (10.7)' started by Yass-Attack, Feb 4, 2012.

  1. Yass-Attack, Feb 4, 2012
    Last edited: Feb 4, 2012

    Yass-Attack macrumors member

    Joined:
    Nov 1, 2010
    #1
    Hey guys, I have my "InstallESD.dmg" image in my Iomega external harddrive. Whenever I go to disk utility and select the drive I want to erase, I go to restore and in the source I drag the InstallESD.dmg and put the drive I want to erase as the destination but then I get an error...this is what it all looks like

    [​IMG]

    I can't unmount my external harddrives partition cause if I do I can't locate the lion osx install image..any tips please?


    Edit: I'm running on Lion now and want to stay on Lion
     
  2. heisenberg123, Feb 4, 2012
    Last edited: Feb 4, 2012

    heisenberg123 macrumors 603

    heisenberg123

    Joined:
    Oct 31, 2010
    Location:
    Hamilton, Ontario
    #2
    Install lion on the external, than restart Mac and hold option choose the external as the boot drive, now you can format the internal drive
     
  3. Yass-Attack thread starter macrumors member

    Joined:
    Nov 1, 2010
    #3
    It didn't quite work. I saw 3 options...the original drive, recovery and Iomega. I clicked Iomega and it just loaded up the computer as it normally would.
     
  4. heisenberg123, Feb 4, 2012
    Last edited: Feb 4, 2012

    heisenberg123 macrumors 603

    heisenberg123

    Joined:
    Oct 31, 2010
    Location:
    Hamilton, Ontario
    #4
    Yes it would look normal but as long as you boot from Iomega you can erase the internal, you can't erase a drive your currently booted on
     
  5. iThinkergoiMac macrumors 68030

    Joined:
    Jan 20, 2010
    Location:
    Terra
    #5
    What the heck are you talking about? You can NEVER erase the drive you're currently booted from, apart from certain nefarious terminal commands.

    OP, you're going about this all wrong. First, tell us what you're trying to accomplish by erasing your internal HDD. Are you trying to reinstall the OS? Are you going to sell it? This will help us figure out exactly how to help you.

    Basically, you're trying to restore an install image to your internal drive. Why? If you're trying to reinstall Lion, that's not going to let you do it. If you want to erase your computer and reinstall Lion, you need to boot from your recovery partition, erase your main partition, and have it reinstall Lion. Alternatively, you could restore the InstallESD.dmg to your Iomega drive (right now, it sounds like you simply have the file on your Iomega drive, which the Mac won't be able to boot from). Note that doing so will erase any data you currently have on your Iomega drive.

    Let us know what you're trying to accomplish and we'll be able to help you out much better.

    As to why it looks normal, the solution is that your Mac is trying to boot from the Iomega drive, failing, and then booting from the internal drive. This is why the internal drive is at the top of the list in Disk Utility (your boot drive always is first) and your Iomega drive is listed later. You can see where, towards the bottom of the window, it says "Mount Point: /" Only the boot drive can have that mount point.
     
  6. heisenberg123 macrumors 603

    heisenberg123

    Joined:
    Oct 31, 2010
    Location:
    Hamilton, Ontario
    #6
    read my edit, i meant you CAN'T erase the drive your currently booted on, the OP is trying to erase his internal drive i told him to boot from lion thats installed on his external to do this, other than the " 'T " on my one word I was not that off
     
  7. iThinkergoiMac macrumors 68030

    Joined:
    Jan 20, 2010
    Location:
    Terra
    #7
    True, but your edit was posted 3 minutes after my post so I could hardly have read it before I posted could I? ;)

    From what I can tell, OP doesn't actually have Lion installed on his external drive, he just has the InstallESD.dmg file sitting on his external drive. His Mac won't, of course, boot from it that way.

    OP really should just use the recovery partition to do all of this, as it would be far easier and wouldn't require finagling with the external drive.
     
  8. heisenberg123 macrumors 603

    heisenberg123

    Joined:
    Oct 31, 2010
    Location:
    Hamilton, Ontario
    #8
    ya your right my edit was a bit late

    correct it won't from the istallesd.dmg

    i told him to install Lion on his Iomega drive so he could use it to boot

    sounds like he did because he has Iomega has a boot choice when i told him to hold option after a reboot

    OP since you have the InstallESD.dmg file

    use this tutorial to make a bootable dvd version of Lion maybe you will find it easier to do what your trying if you have a bootable dvd

    http://www.mactrast.com/2011/09/how-to-create-a-bootable-dvd-disc-for-os-x-lion/
     
  9. Yass-Attack thread starter macrumors member

    Joined:
    Nov 1, 2010
    #9
    Problem resolved

    I did what you told me to do and it worked out well! Thanks a lot for your help and you too iThinkergoiMac!
     

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