If you are scared using command line changing drive letter can be done via GUI using the disk management tools interface.
If you are command line junkie, in Windows 7 or Windows 8 to change drive letter using command line is quite straight forward as well.
And one advantage of using command line if you need to change one or more computers, you don't need to disturb the user or visit the workstation.
Scripting using command line will automate the process.
To change using command line, open an elevated command prompt and type: diskpart
On diskpart window, type:
list volume and press enter
List volume will show all the volume available on the computer.
Select the volume you wish to change the drive letter.
Select volume 0 and press enter
Above command will select volume 0.
To changed drive letter of volume 0. Type this command:
Assign Letter=B and press enter
Assign letter=b, is quite straight forward command. It will assign the specified letter to the currently selected volume.
Type: exit and press enter.
Diskpart will be exited and open explorer; you will notice that volume 0 letter has been changed to drive B.
See image below, on my system which I run this command.
Volume 0 refers to the DVD drive; it could be different on your system.
That's it three command lines is needed on diskpart to change the drive letter.
1. List volume -- to list all volumes on the computer
2. Select volume #number -- select the desired volume number from the output of list volume
3. Assign Letter=Drive_Letter -- assign a value or drive letter for the selected volume
Cheers..Hope it helps..