Performing an upgrade install of Mountain Lion from a USB drive

Hi.
I performed a clean install of Mountain Lion on my MacBook Air a few days ago, and made a ML boot disk to use with my other Macs. I was wondering whether it is possible to use that boot disk to perform an upgrade (not clean) install on a MacBook Pro with Lion.
Thanks.

VictorT wrote:
Hi.
I performed a clean install of Mountain Lion on my MacBook Air a few days ago, and made a ML boot disk to use with my other Macs. I was wondering whether it is possible to use that boot disk to perform an upgrade (not clean) install on a MacBook Pro with Lion.
Thanks.
Did you save the Mountain Lion Installer application? That's what does either an upgrade or a full install; a ML boot disk is just another bootable disk with ML already on it.

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While intending to perform a clean install of Mountain Lion while continuing with old apps and files, is it a waste to restore a backup that was made while running Mountain Lion as an UPgrade from Lion?

While intending to perform a clean install of Mountain Lion while continuing with old apps and files, is it a waste to restore a backup that was made while running Mountain Lion as an UPgrade from Lion?
Originally I was running Mountain Lion as an UPgrade from Lion. I created a backup in Time Machine, performed a clean install of Mountain Lion, then I proceeded to use Time Machine to restore the back up.
When thinking about the essence of a back up restore, it occurrs to me that for all I know, I may have just wated my time IF Time Machine also restores all the old unneeded files that remain from Lion after an upgrade.
Since the backup was made while running Mountain Lion as an upgrade from Lion, did restoring this backup defeat the purpose of a clean install by reinstalling old Lion files?
If so, how can I re-do the last portion of the process so that I get all my home-folder files and apps back without the full bulk of old Lion files? Migration assistant I'm guessing?
-Chris

Hello John!
Thank you for your response which solved my problem. For other users who may stumble upon this, I'll clear up the confusion and share how I solved the problem with your help; When looking for answers to my computer problems, finding unresolved questions where person B offers a solution and person A never comes back and says "That worked, thank you.", it demonstrates a "k-thnx-bye" user mentality that leaves others with the same problem lost. Without further ado:
It is not clear what you did because the meaning of "clean install" is vague. You can erase a volume and install an OS which leaves none of its previous content intact,
This is what I did: I erased the volume leaving no previous content intact, while then installing OS X Mountain Lion.
or you can upgrade an existing OS (or reinstall the same one) which does not alter your user - installed files.
An upgrade to Mountain Lion from Lion is what I started with initially before erasing anything. This was undesirable. Since this can cause Macs to run slower (especially whereas I'm using a mid-2011 Mac Mini), my goal was to go from operating within an upgrade to Mountain Lion, to operating within an installation of Montain Lion that was not preceded by any other oprating system.
Hence a "clean install of Mountain Lion while continuing with old apps and files" is confusing.
Well put and understood. What I should have said was:
1.Erase the volume
2.Install Mountain Lion clean
3.Confirm that Mountain Lion is functioning properly
4.Proceed to use either Time Machine or Migration Assistant to Import/Migrate/Copy over only two things; My old apps (That had been stored originally in the designated Applications folder) and all files and folders originally stored in the home folder under users.
If you restore from a Time Machine backup then all modifications that occurred subsequent to that backup become erased. It renders moot any OS X upgrade performed subsequent to that backup.
That makes sense and is just as I later suspected.
If so, how can I re-do the last portion of the process so that I get all my home-folder files and apps back without the full bulk of old Lion files? Migration assistant I'm guessing?
Yes.
This is what I did and everything works perfectly. Thank you so much once again!
-Chris

How to perform a clean install of Mountain Lion on MBA without usb?

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Hi, So my Macbook 7.1 (running macosx 10.6.8) was running really slow due to poor user maintenance. I decided that i should purchase Mountain Lion and install it over the 10.6.8 version. That worked but my computer turned SUPER SLOW. So i decided to completely startover and erase the partition, and install from the USB. Unfortunately for me this is where my skillset ends, and I need help.
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After a close call in which the internal drive on my late 2009 21.5" iMac needed repairs unexpectedly, I acquired a replacement drive (WD Black 2TB) on which I planned on starting fresh with a clean install of Mountain Lion rather than cloning the existing installation that went through so many upgrades over the past 3+ years.
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Rize_T0ad wrote:
I have mountain lion in a Dmg file on my mac and plan on putting the Dmg on a usb.
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Performing an upgrade install of Mountain Lion from a USB drive

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