How to detect Disk drive letter using batch code -

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i need guys. want create batch file detect running dvd in disk drive , after that, want batch file write it's letter text file. can me wiritng batch code so? hope can me. thank you.

this list drive letters in drives.txt:

@echo off %%a in (a b c d e f g h j k l m n o p q r s t u v w x y z) (if exist "%%~a:" echo %%~a: >> drives.txt)

which produced me:

c: p: r: s:

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