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  1. #1
    Scrubbing disk and reinstalling OS

    Member Since
    Jul 06, 2013
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    Question Scrubbing disk and reinstalling OS
    If I back up my MacBook Pro OS to an external drive, can I reformat the disk and then reinstall Mt. Lion from the external drive?
    Thanks in advance for the help.

  2. #2
    Scrubbing disk and reinstalling OS
    Slydude's Avatar
    Member Since
    Nov 15, 2009
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    North Louisiana, USA
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    2.8 GHz MacBook Pro 10.10.2, 8 GB mem, iPhone 6+
    How you do that depends upon what you use to do the backup. if you make a "clone" of your internal drive then yes that works. Internet connection to re-download Mountain Lion. If you are using a Time Machine backup you would need to boot from the recovery partition and restore files from your backup. That might also mean re-downloading Mountain Lion if you did not include iy in the Time Machine backup.

    Here's what I would do. It leaves you with the most flexible option in the event of a drive failure.

    1, Download and install Carbon Copy Cloner.
    2. Clone your internal drive to the external drive,
    3. Reboot your Mac holding down the option key. When you get to select the drive to boot from select the external drive.
    4. If everything is running properly from the external drive go to the utilities folder on the external drive and run Disk Utility to format the internal drive.
    5. Now run Carbon Copy Cloner again and clone things from the external drive back to the internal drive.
    Sylvester Roque Former Contributing Editor About This Particular Macintosh

    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  3. #3
    Scrubbing disk and reinstalling OS

    Member Since
    Jul 06, 2013
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    7
    A follow-up question
    Thanks. That's very helpful. I've also read that In Disk Utility, I could select the disk or volume in the list with the free space I want to erase.

    Then click Erase and click the Erase Free Space button.

    Would this get my disk cleaned off except for the OS and would it be a simpler solution?

    Thanks again.

  4. #4
    Scrubbing disk and reinstalling OS
    Slydude's Avatar
    Member Since
    Nov 15, 2009
    Location
    North Louisiana, USA
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    8,552
    Specs:
    2.8 GHz MacBook Pro 10.10.2, 8 GB mem, iPhone 6+
    Not if you want to start with a clean installation of the OS. Are you trying to start with a clean installation of OS X?

    If you are doing a clean install because of a problem let us know the type of problem. A clean install may not be needed.
    Sylvester Roque Former Contributing Editor About This Particular Macintosh

    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  5. #5
    Scrubbing disk and reinstalling OS

    Member Since
    Jul 06, 2013
    Posts
    7
    Actually, what I'm trying to do is clean most stuff off the Mac except for the OS so I can sell it. I would like to keep; some of the apps for the eventual owner but would forgo that if I could get an easy solution.

    Does this help?

  6. #6
    Scrubbing disk and reinstalling OS
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
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    Nambucca Heads Australia
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    Specs:
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    Clone as suggested using SuperDuper or Carbon CopyCloner, remove the apps you wish to keep and then set up a new account and delete your existing account.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  7. #7
    Scrubbing disk and reinstalling OS
    chas_m's Avatar
    Member Since
    Jan 22, 2010
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    Victoria, BC
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    Mid-2012 MBP (16GB, 1TB HD), Monoprice 24-inch second monitor, iPhone 5s 32GB, iPad Air 2 64GB
    Actually, let me stop you right there. I understand exactly why you'd want to give them a copy of the OS on this machine you're selling them, but in fact that's a mistake (and a violation of the license).

    If you give them a copy of Mountain Lion, it will be your copy, tied to your Apple ID; and it will require your password every time they need to upgrade it. I think you can see why this is a bad idea.

  8. #8
    Scrubbing disk and reinstalling OS

    Member Since
    Jul 06, 2013
    Posts
    7
    Wow! I never thought of that. Thanks for bringing this to my attention. So what would I have to do to include an OS? I see Mac products on Amazon all the time that have OSes.

  9. #9
    Scrubbing disk and reinstalling OS
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,051
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    Well depending on the precise model which has not been stated, Snow Leopard OS X.6 DVD is available from Apple Online for $20 including postage. Snow Leopard will run on up to a late 2010 model and maybe early 2011.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  10. #10
    Scrubbing disk and reinstalling OS
    chscag's Avatar
    Member Since
    Jan 23, 2008
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    Fort Worth, Texas
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    45,262
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    Actually, Snow Leopard will run on a Mid 2011 iMac. Later that year, the 2011 iMacs were shipped with Lion.

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