@CDROM[d:] :  Returns 1 if the drive is an optical drive (CD-ROM, CD-RW, DVD, etc) or 0 otherwise. The drive letter must be followed by a colon.

 

If the argument is a partial filename without a drive, @CDROM will expand the filename to get the drive.

 

Examples:

 

echo %@cdrom[C:]

0

 

echo %@cdrom[G:]

1