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Old Nov 25, 2012, 02:48 AM   #1
phr33k
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Join Date: Nov 2012
Help - How to do a clean install of Mountain Lion on Mountain Lion

Hi guys,

This may seem like a dumb question, but I have been searching for ages and can't get what I need. I used cmd-r and reinstalled OSX 10.8 from there, but i didn't realise it wasn't a clean install. All my apps and files are still there.

My Air cam with Mountain Lion preinstalled, so how to I download it to do a totally clean install without paying for it in the mac app store as I don't fancy paying for it again? Or it it possible to do a clean install from the cmd-r?

I really appreciate and help.

David

Last edited by phr33k; Nov 25, 2012 at 04:48 PM.
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Old Nov 25, 2012, 03:06 AM   #2
bluespaceoddity
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After booting with command-r did you use Disk Utility to erase the drive before running the Mac OS installer?

An other way is to make a Mountain Lion Installer on a USB drive and use Disk Utility on that to Erase the internal drive prior to installation of the OS.
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Old Nov 25, 2012, 03:20 AM   #3
phr33k
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Thanks for help. Yes i read that i need to erase it, however, where can i get a copy of the installer from? As surely when i erase it the cmd-r won't work?
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Old Nov 25, 2012, 03:26 AM   #4
bluespaceoddity
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If your Air is new enough and came with Mountain Lion Installed originally, restoring it will work with command-r even on an erased/empty SSD. (You need to have an internet connection when you do that - Internet Restore)

You should also be able to (re)download ML without paying using your Apple ID if you paid for it originally and the restore partition can be created on an external drive using Recovery Disk Assistant:
http://support.apple.com/kb/DL1433
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Old Nov 25, 2012, 03:41 AM   #5
phr33k
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Quote:
Originally Posted by bluespaceoddity View Post
If your Air is new enough and came with Mountain Lion Installed originally, restoring it will work with command-r even on an erased/empty SSD. (You need to have an internet connection when you do that - Internet Restore)

You should also be able to (re)download ML without paying using your Apple ID if you paid for it originally and the restore partition can be created on an external drive using Recovery Disk Assistant:
http://support.apple.com/kb/DL1433

Excellent. Thats exactly what I needed to here. Cheers buddy
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Old Nov 25, 2012, 03:52 AM   #6
phr33k
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Ok just to clarify, as I'm sure you can understand I am a bit nervous.

If I erase my ssd using the utility on cmd-r, then reboot cmd-r and click on restore it will work when I am connected to the internet?

Sorry if you are repeating yourself...
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Old Nov 25, 2012, 04:09 AM   #7
bluespaceoddity
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No problem. I understand that.

If you want to be absolutely sure you can check whether or not your particular MB Air supports this recovery method by posting the question in the Air subsection of the forum but as far as I know this should work as long as you have an internet connection and everything goes as designed.
http://www.apple.com/osx/recovery/

Since you are completely erasing everything I'm assuming you have back-ups of your files.

Start with cmd-r
Use Disk Utility to erase the SSD
Exit Disk Utility
Install OS (Check that you still have an internet connection at this point - a clean System will be downloaded from Apple directly at this point)

You should only have to restart after this installation

If you want to erase the entire SSD including the recovery partition you need to start up from an external drive - which you can prepare to become the startup volume from which you initialise the re-installation of a clean OS as well.
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Old Nov 25, 2012, 07:13 AM   #8
phr33k
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Thank you very much. It went exactly as it should. I erased the HD using the disk utility then reinstalled it using cmd-r. Now I'm back to a system lie when I got it. It will be handy to do this every year or whatever to keep it fresh.
Thanks again.
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