How to wipe HD and do a fresh Lion install to sell laptop?

[Gherkin]

I have a 2010 MBP that I am selling. ~3 weeks ago, I upgraded that machine to Lion.

Last week, I bought an iMac. I did the Migration Assistant thing and transferred everything from the MBP to the new iMac.

Now I want to wipe the HD on the MBP clean and put a fresh install of Lion so I can sell.

So, I restart the MBP, I hold down CMD+R during the boot up, I select Disk Utility, and I select my drive and click erase. I get an error that says "Couldn't unmount drive."

Not sure how to proceed.

 

[Gherkin]

Nevermind.

For example in this image:

I was selecting "75.5 GB Hitachi" instead of "Macintosh HD." I guess you are essentially erasing your Home folder on the machine when you do this.

 

[saulinpa]

It may be moot. The Lion that you downloaded is not transferable

The license agreement:

If you obtained the license to the Apple Software from the Mac App Store, it is not transferable. If you sell your Apple-branded hardware to a third party, you must remove the Apple Software from the Apple-branded hardware before doing so, and you may restore your system to the version of the Apple operating system software that originally came with your Apple hardware (the "Original Apple OS") and permanently trnsfer the Original Apple OS together with your Apple hardwre,

 

[cinematicme]

I have a 2010 MBP that I am selling. ~3 weeks ago, I upgraded that machine to Lion.

Last week, I bought an iMac. I did the Migration Assistant thing and transferred everything from the MBP to the new iMac.

Now I want to wipe the HD on the MBP clean and put a fresh install of Lion so I can sell.

So, I restart the MBP, I hold down CMD+R during the boot up, I select Disk Utility, and I select my drive and click erase. I get an error that says "Couldn't unmount drive."

Not sure how to proceed.

You have to put the OS the machine came with back on before you can sell it.

 

[Quad5Ny]

Grab your grey install discs and http://support.apple.com/kb/HT3910