Can not remove mac osx base system drive

Hi folks..
Just trying to do a complete clean install of Mountain Lion. I booted up from a USB and erased the Macbook hardrive completely.
However I see a second drive/partition below that says 'disk2 - Mac OSX Base system' and it's about 2 gigs in size. I want to wipe and delete this too so that I will have just one single partion but disk utility will not letr me even touch it.
The 'erase' and Security options are greyed out and inactive and there is some text to the right that says: "This is the start up partition you can not erase it".
I don't see how it can be a start up partition as it's only 2 gigs in size and the main 750 gig drive has already been wiped.
How can i get rid of this drive/partition completely?
Thanks.

That's Mt. Lion's Recovery volume which you could have used to erase the working volume and do a clean install of Mt. LIon.  To get rid of it you may have to try to repartition the entire drive with Disk Utility. 
Otherwise, reboot with the Command+R keys held down to boot into the Recovery volume.  Once there run Disk Utility to again erase the working volume and then do an install of Mt. Lion. This method is much easier and quicker than doing it from the USB device.
OT

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