1. Right-click My Computer, and then click Manage.
2. Under Computer Management (Local), click Disk Management.
3. In the list of drives in the right pane, right-click the USB drive and then click Change Drive Letter and Path(s).
4. Click Change, and in the drop-down box, select a drive letter for the new drive that is not assigned to a mapped network drive.
5. Click OK, and then click OK again.