You must be logged on as an administrator to perform these steps.
If you don't like the letter Windows has assigned to a new drive or you want to organize your drive letters in a certain way, you can change the drive letter.
You can assign the letters C through Z to each drive on your computer. A and B are usually reserved for floppy disk drives, but if your computer does not have floppy disk drives, you can assign A and B to volumes. You can see which drive letters are used on your computer by opening Computer.
Open Computer by clicking the Start button , and then clicking Computer.
You can change, add, or remove a drive letter by using Computer Management.
Open Computer Management by clicking the Start button , clicking Control Panel, clicking System and Maintenance, clicking Administrative Tools, and then double-clicking Computer Management.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
In the Navigation pane, click Disk Management.
Right-click the partition or drive that you want to change, and then click Change Drive Letter and Paths.
Do one of the following:
To assign a drive letter if one has not already been assigned, click Add, click the letter that you want to use, and then click OK.
To change a drive letter, click Change, click Assign the following drive letter, click the letter that you want to use, and then click OK.
To remove a drive letter, click Remove, and then click Yes to confirm that you want to remove it.
Many MS‑DOS and Windows programs make references to specific drive letters. If you change a drive letter, some programs that you have installed on your hard disk might not work correctly.
You cannot change a drive letter if the drive is either a system partition or a boot partition. If you get an error, the partition or drive you are trying to change might be in use. Close any program or window that is using the partition or drive and try again.