DriveLetterView to modify assigned drive letter
1. Download DriveLetterView utility from utility webpage.2. Once zip file is downloaded, double click unzip and view contents.

4. Utility interface will open listing drive partitions on your Windows computer. It also show drive letter listing for CD, DVD and USB drives.

6. Then type new letter for specific partition in the pop-up box. Click OK to save changes for new drive partition letter name.
You cannot attempt to assign drive letter that is already being used. Using this utility you can quickly rename drive partitions as per requirement and comfort of usage.