I'm guessing you are on windows. I'm not completely sure what you mean when you say that it looks like a map, but if you are in documents and settings then its usually as simple as typing the following:
cd \
this takes you back to the root of whatever drive you are on, and assuming you are on a base setup it will take you to the root of your C:\ drive
You can access any drive by typing in its letter then colon, c: d: e: etc..., on a windows based system. If you are on a *nix based you can use cd / to get to the root directory. To access other hardware you need to mount it. Also from the windows command line you can cd directly to a directory you know exists, cd c:\windows\system , and you can also view contents of a directory you are not currently in, dir c:\windows\system . Hope this helps.
Thats all true, though usually if your moving between 2 drives in win and typing the drive name it will take you to the last place you were on that drive. At least as far as I know.