DosTips.com

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setlocal EnableDelayedExpansion

set /p Drive=Please enter drive letter. Example C 
call :Uppercase Drive
set "colin = :"
set "Drive &= %colin%"
Echo %Drive%
pause
goto:eof

:Uppercase
set %~1=!%1:a=A!
set %~1=!%1:b=B!
set %~1=!%1:c=C!
set %~1=!%1:d=D!
set %~1=!%1:e=E!
set %~1=!%1:f=F!
set %~1=!%1:g=G!
set %~1=!%1:h=H!
set %~1=!%1:i=I!
set %~1=!%1:j=J!
set %~1=!%1:k=K!
set %~1=!%1:l=L!
set %~1=!%1:m=M!
set %~1=!%1:n=N!
set %~1=!%1:o=O!
set %~1=!%1:p=P!
set %~1=!%1:q=Q!
set %~1=!%1:r=R!
set %~1=!%1:s=S!
set %~1=!%1:t=T!
set %~1=!%1:u=U!
set %~1=!%1:v=V!
set %~1=!%1:w=W!
set %~1=!%1:x=X!
set %~1=!%1:y=Y!
set %~1=!%1:z=Z!
goto:eof

cmd /k

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@echo off
setlocal EnableDelayedExpansion
set /p Drive=Please enter drive letter. Example C 
for %%j in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do (
    set "Drive=!Drive:%%j=%%j!"
)
set "colin=:"
set "Drive=%Drive%%colin%"
echo %Drive%
pause

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@echo off
set /p Drive=Please enter drive letter. Example C 
for /f "delims=" %%i in ('powershell -c "'%Drive%'.ToUpper()"') do (
    set "Drive=%%i"
)
set "colin=:"
set "Drive=%Drive%%colin%"
echo %Drive%
pause

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C:\Users\Squashman>set "drive =C"

C:\Users\Squashman>echo %drive %
C