Erase hard drive w/o removing latest Mac OS version

I am thinking of selling my iMac 27' because I need cash money.
I downloaded and installed Lion on my Mac once I got it.
My question is,
Is there a way I can swipe my drive clean and still keep the latest version of the Mac OS installed on the drive?
also,
How do I find out which iMac model I have?
-Peace

D TiEra wrote:
Is there a way I can swipe my drive clean and still keep the latest version of the Mac OS installed on the drive?
Technically, that's a violation of the license.
When you buy a Mac with Lion installed, the license allows you to transfer it along with the Mac if you sell it. But the license for Lion purchased via the App Store or a USB stick is different. You're supposed to erase the drive, reinstall the version of OSX that came with it, and provide the original disc(s) to the buyer.
(However, if your Mac came with Leopard and you upgraded to Snow Leopard, you can install Snow Leopard and include the Snow Leopard Install disc)
Then the new user should go to the App Store and purchase Lion ($29.99).
If you don't do that, and the new user ever wants or needs to reinstall Lion, the Recovery HD won't allow it.

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