The volume %s is currently in use. If you continue, the new drive letter will be assigned, but you can still use the old ...

The volume %s is currently in use. If you continue, the new drive letter will be assigned, but you can still use the old drive letter to access the volume until you restart your computer. The old drive letter will not be available for assignment until you restart.  WARNING: Changing the drive letter of a volume might cause programs to no longer run. Do you want to continue?