Ok. First things first. "Sudo" is not absolute root. To become root completely, do either "su" or "sudo su". Then, your terminal will say "root@whatever :$". Not just "blah@whatever :$" or whatever it looks like (on Windows right now..).
Next. You want to type in the EXACT name of the file. Sometimes, when cd'ing to a directory, I have to do
and type the WHOLE path to the file, even if it's contained within 20 other folders.Code:$ cd /home/"username"/desktop/Blah/Blah
So, what you might want to try to do is...
Complete root-ness.Code:sudo su
This will open up a window with the contents of the device.Code:nautilus /media/(drive name)
Since you are "root", you should be able to copy the .iso to your desktop (or wherever) and it will be on your hard drive.
Edit: Also, I have no idea where your drive is located. It may be /dev or /media or some other name, I really don't know. Try opening your home directory and look to the left; its got a bunch of other places to access, and I think your CD drive might be one of them. If it is, then open it up, and copy the .iso to your desktop.