Batch script to detect CD/DVD-rom drive

REM Check if we have a CDROM drive
Setlocal EnableDelayedExpansion

echo list vol > diskpart.txt
diskpart /s diskpart.txt > dp_volumes.txt
set hascdrom=0
FOR /F "delims=," %%v in (dp_volumes.txt) do (
rem echo %%v
set str1=%%v
rem echo Line is !str1!
rem echo "x!str1:ROM=!"
rem echo "x!str1!"
if not "x!str1:ROM=!"=="x!str1!" set hascdrom=1
rem echo !hascdrom!
)
if "!hascdrom!"=="0" GOTO nocdrom

:cdrom
echo We have a CD/DVD-rom
goto :EOF

:nocdrom
echo No CD/DVD-rom drive available
goto: EOF