I’m not sure we even need that terminology at this point… I knew it from hard drives but I’m either 1) dealing with way more than two drives, or 2) using Linux which I don’t even think of as a master/slave so much as a fuck-you-mount-me-or-not-I-don’t-care partitions.
I’m not really sure where else it’s used, especially since everything else seems to just be primary/secondary. But I’m no CS major so IDK.