Fun Fact: When a Sega CD disk is put into a CD player, a loud warning message telling the user to eject the disk will play. This warning, along with many more, was made due to possible damages caused by ROM data on the CD to the CD player.
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i nerverd know that
Same with the Dreamcast! Plus if you put in a certain game disc, it will give a custom sound! [Don't do it tho cuase I had to replace my 4th Shenmue disc] xd