Hard Drives Disapeared!


I accidentally switched all of my hard drives except my boot drive using "No Access" in the permission box in the Get info menu.
Now, My drives do not even appear on my desktop so I can change the permissions back. I've looked everywhere to try and access those drives. I read that I can use terminal to get them back but I've never used terminal before. I don't want to mess up my system. Please Help!!