I remember in Win9x I could assign a permanent drive letter to a HDD. I can't find any such option in Vista and it sometimes causes me an issue where the external HDD letter changes because I had more than one external HDD or thumb drive connected. That makes media players lose the drive letter it is monitoring and have to rescan the library with the new drive letter. I keep all my MP3s on an external HDD and a few times now I have had to rescan the library into foobar because of this above issue.