Yes... if you have just the OS and nothing else installed on the drive, a 32GB USB key would easily hold a clone of that. Even a 16GB drive would.
While all of you were responding trying to help one confused person, I discovered this...
Currently I have two USB drives.
The first one is 32GB and apparently a clone of just the original Mountain Lion for my current old MBP.
The second one is 64GB and apparently a clone of Mountain Lion, the Recovery Partition, and apps with no data for my current old MBP.
Since my current MBP is without an internal HDD and running on its last leg with an external HDD that is an outdated clone, now is not a good time to test these thumbdrive more, but I believe they will work.
That being said, I think I will take the 32GB, clear it off, and use CCC to clone my new rMBP - if I ever get it out of the box!
That way I have a way to rebuild my old MBP and my new rMBP to basically factory condition.
As mentioned above, I don't think that matters as much with my new rMBP since I hope to have at least weekly clones of it on an external SSD.
But for my old MBP, having that USB drive I apparently created several years ago will be handy if I want to use my old MBP as a test machine. Now I can break the OS, wipe the HDD, and use the USB drive to reinstall things to a new machine. THis will be a good way for me to strengthen my Mac skills - if only I can find the time!
Thanks to all for your patience and help in this thread!!
