The root directory is a general starting place on each drive. If you have a computer that is MS-DOS only, when you turn on this computer you see something that looks like C:\>. This, as we have noted previously, is called the C prompt. The backward slash with no words after it tells you your location in the computer's organized filing system is at the root directory of drive C. By typing a: and hitting the enter key you would see the prompt change to A:>. This would indicate you are at the root directory of A drive.
Notice that a: was typed at the C prompt instead of A: in order to change the drive location. Was this a mistake? If not, why not?
The root is important because you always know where it is. Which instructions make more sense?
Go into the third house on the right.
or
Start at the corner of 4th and Main. Face the water tower. Go into the third house on the right.