Currently Being ModeratedFeb 3, 2013 5:58 PM (in response to Mactoyz)
Your new iMac has a Recovery Parition for just that reason.
There is really no need to make a USB drive as you are suggesting.
On the other hand what I do is create a bootable clone of the complete system disk. If anything goes wrong with my drive I can simply boot from the clone and I am back up and running again.
Currently Being ModeratedFeb 3, 2013 6:00 PM (in response to Mactoyz)
You have one on your iMac, the recovery partition. Your iMac is not compatible with the App Store version so don't try.
Install OSX on to a thumb drive if you want, it's a waste of time compared to using Recovery.
Click this link for a Google search for 3rd party suggestions.
Currently Being ModeratedFeb 3, 2013 6:11 PM (in response to Csound1)
I have not dug into the recovery partition yet. The one puzzler is why isn't my iMac compatible with the App store verison of Mountain Lion. My reason for wanting the thumb drive is so I can run Drive Genius and do a defrag. Migrating from my old iMac to my new one has really fragmented the drive.
Currently Being ModeratedFeb 3, 2013 6:16 PM (in response to Mactoyz)
Because the new iMacs have their own version.
Do not use Drive Genius to defrag your Mac, it and iDefrag are junk. Clone your drive, then erase your drive then restore the clone and there will be no fragmentation.