here To change an existing drive letter on a drive, partition, or volume: 1. Log on as Administrator or as a member of the Administrators group. 2. Click Start, click Control Panel, and then click Performance and Maintenance. 3. Click Administrative Tools, double-click Computer Management, and then in the left pane, click Disk Management. 4. Right-click the drive, partition, logical drive, or volume for which you want to assign a drive letter, and then click Change Drive Letter and Paths. 5. Click Change. 6. Click Assign the following drive letter (if it is not already selected), click the drive letter that you want to use, and then click OK. 7. Click Yes when you are prompted to confirm the drive letter change. The drive letter of the drive, partition, or volume that you specified is changed, and the new drive letter is displayed in the appropriate drive, partition, or volume in the Disk Management tool.