That's just to specify the dvd drive for a command so it can locate it.I didn't really get what to replace the red with
the 'normal' is for your dvd drive, /dev/scd0
if you had 2 drives then the other one would be /dev/scd1
But normal isn't 'all the time'
If you wanted to see the 'device locations' of your drives run this in a terminal, it will show most of the 'names' that point to each drive.
Code:sudo lshw -C disk
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