Diskpart, drive letter removal using a wildcard

Question

I am trying to write a diskpart script to automatically set a drive letter to "F" the disk is always plugged into the same port, but anytime the computer reboots it assigns a different drive letter, but it never hands out the "F" letter
to any other drives.
The problem is it assigns a different letter each and every time, so I need to use some type of wildcard for the drive letter, the volume number never changes, but unless you know the drive letter you can't change the letter, therefor I can't use a script
to do this when the computer starts up.

Answer 1

I am trying to write a diskpart script to automatically set a drive letter to "F" the disk is always plugged into the same port, but anytime the computer reboots it assigns a different drive letter, but it never hands out the "F" letter to any other drives.
The batch file below uses mountvol.exe to check if disk volume 
\\?\Volume{d02e521f-71f1-11e3-be41-00262221fd8d}\
is mounted against a drive letter. If so then it will unmount it. It will then mount this volume on drive letter F:. You must run the file under elevated privileges.
@echo off
set Found=false
set Drive=
set Vol=\\?\Volume{d02e521f-71f1-11e3-be41-00262221fd8d}\
for /F %%a in ('mountvol.exe') do call :Sub %%a
if not "%drive%"=="***" mountvol %Drive% /d
mountvol F: %Vol%
goto :eof
:Sub
if %Found%==true if "%Drive%"=="" (set Drive=%1& goto :eof)
if %1==%Vol% set Found=true
This worked. Thank you for the help.