Unmount in diskutil fails for all disks

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:confused:
I have a Mac Book Pro that came with Snow Leopard. Recently I purchased Mountain Lion from Apple and my system has not worked well since.
I made the mistake of trying to erase my HD from the internal disk utility to remove Mountain Lion and now I can't re install from my CD.
I can't do anything in either disk utility with the three drives showing mounted. I can't download anything because the erase disk ended making a partition that took up 150.3 of my 160 space and won't allow me to re size it.
All three disks are partitions and all the same disk from what I can see and unable to unmount. Close files and apps still running is the error I get back.
Recovery on both Mountain Lion and the CD both apps are dimmed and not accessible.
It seems that the internal recovery disk has been deleted also. I tried safe restart, start from CD, start from options etc to use disk util and terminal but all are acting the same. There is no recovery disk image available and the Mac OS X Install from DVD wants to install and there is no room. Mac OS X Install from ESD wants to install also. The other disk is named Mac OS X Base System. Info says it has many files but when I check the file under computer drop down menu, it says alias and 1 byte.
The other two disks created when I attempted to try to copy to new image so that I could erase the original. They copied but now can't erase any of them.
The only options available in disk utility for any of them is verify disk. Repair works for the original but that is as far as it goes. Very for the other two, the final line saying the disk appears to be ok is highlighted in green.
I am clueless with this stuff as you can see.Anyone have a clue or two to lend?
Should I attempt restart in single user, verbose or reset PRAM? I don't want to make matters worse than they already are.
 
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Hi,

Not sure what you actually did, but this is how I would have done it.

1) Backup everything. (Very important)
2) Insert the Snow Leopard disk.
Snow-Leopard-Disk.png
3) Shut-down your Mac, switch it back on and hold down the "Option" key and select Snow Leopard.
4) Use Disk Utility to erase your Hard Drive completely.
5) Now use the OS X Installer, install Snow Leopard onto your new clean hard drive.
Snow-Leopard-Install.jpg
6) Restart your Mac, connect your backup external hard drive and use your backup program to restore all your files and folders to Snow Leopard.
 

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