The Disk Management snap-in is an administrative tool for managing hard disks and the volumes or partitions that they contain. Use the Disk Management snap-in when you want to add, to change, or to remove drive letters on drives, on partitions, or on volumes on your computer’s hard disks, CD-ROM drives, and other removable media devices.
1. Right click–> My Computer.
3. In the Computer Management sidebar–> click Disk Management.
4. Right click on the drive letter you want to change.
d. For a drive that has “No Media” under it–> the drive letter will be in that same box.
5. click “Change Drive Letter and Paths“.
6. In the “Change Drive Letter and Paths for (drive letter:)” window–> click “Change“
7. In the “Change Drive Letter or Path” window click the dragdown selection box with the drive letters in it and click the letter you want the drive to be.
9. If you have a program using the drive you want to change, you will get an additional warning. Unless you really know for certain what you are doing, select “No” and find the open program.