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I recently bought the Dreamcast theme for my Nintendo 2DS. When you wake the system from sleep, it plays the sounds of a CD spinning up and a VMU memory card beeping.
The VMU would beep at startup when its battery was dead, which was most of the time because the battery lasted for like an hour.
Someone at Sega loved the Dreamcast enough to subtly make fun of it.
It turns out they recorded these startup noises from an *actual Dreamcast*
http://segabits.com/blog/2015/03/23/how-sega-recorded-authentic-sounds-for-their-console-based-3ds-themes/