@Blurry Moon If you get a Hi-MD portable music player/recorder, you can connect it as a data drive to a computer (even with standard Mini-Disc, if you format them as Hi-MD in your recorder); Hi-MD gives you about 1Gb, standard MD less than 300Mb.
Me what I want is a 2000s Mini-Disc head unit, but of course my car is too recent and recent cars can't realistically get 3rd party head units. And they're pretty hard and expensive to find with full coverage of north american FM radio bands; there's tons of JDM ones, but Japan's FM radio bands are not quite the same.