Greetings all, I have a Mac Book Pro that came with Snow Leopard and not long ago I purchased Mountain Lion and installed from the app store. It totally slowed down the performance so a few days ago I attempted a HD erase and re-install from CD. Always what we learn after the fact! I tried to erase from the core storage utility instead of the utility on the disk. Then I made matters worse by trying to fix it. I did a partition that somehow ended being 159.3 of my 160 memory, so now there is no space on the recovery disk or the system disk to install and I can't re-size the partition. I now have the Hitachi drive with and orange disk under it titled Mac OS X Install CD. Under the super drive line, in attempting to create a new disk image to copy to, I also have disk1 (orange) called Mac OS X ESD Journalled and disk2 (orange) Mac OS X Base System. Both names that were in the drop down menu. Now I can't get anything to work in disk utility except verify disk. Always not able to unmount disk. Check app for open files. I did a start up from C and CD but utilities is low lighted so I can't access. I was then advised to open terminal and type unmountDisk 1 and 2 but getting back that some files could not unmount. Many of the "verbs" when I type diskutil list are responding as not recognized. I have ADHD so I can't remember exactly where I saw in terminal that I have 13 disks running? All of which I got unmounted but the ones listed above. I've done enough damage in disk utilitiy and don't want to mess more in terminal commands. I have been advised to zap pram? and try fs k? something but as you can see...I am clueless! I have no experience with disk utilities obviously and I may have to replace the HD I guess. With no room, I can't install disk manager and when I seek out files, the ones I would need like Mountain Lion are dimmed out. Anyone have the clue that I don't? Thanks in advance if you do.