I'm surprised the sounds of a floppy (3½", 5¼", and maybe even an 8") are all missing. I'd argue that the insertion and lock sounds, and seek sounds are absolutely necessary, at the very least.
Now that I think about, for completeness sake both 9-pin and 24-pin varieties of dot matrix printers should be included as they each produce a unique sound.
Turns out they have more of this weirdly relaxing recordings on their Bandcamp: https://staalplaatlabel.bandcamp.com/album/symphony-2-for-do...
GROAN CHK CHK CHK CHK GROAN blinking red light.
"Oh I guess this disk is worn out I won't get to play that game any more"
Didn't old hard-drives use to make sounds as well?
If the drive was silent and/or the LED was solid on, probably time for a reboot.
It was mostly the hard drive of course (RLL drives IIRC), but the system as a whole had a unique sound.
The build went from nearly silent to keep my wife up at night.
There is a certain thunk-thunk-thunk sound they make, which was awful, but I'm almost positive the 10T disk managed to resonate through the front panel and use it to make itself known. I don't think I can blame the disk for that second part.
The best part is that I'm pretty sure the audio samples typically come from truly ancient full-height 5¼" stepper motor based drives.[0] The advent of voice coil actuated heads seriously helped quite hard drives.