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If "Master/Slave" terminology in computing sounds bad now, why not change it to "Dom/Sub"?
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
I mean that does actually work better. If there's only one, it has to be the Primary. If there's two, one of them has to be the Primary and the other one is the Secondary. That makes more sense to me. Because neither drive is sending the commands here, the IDE controller either built into the motherboard or on an expansion card is sending the commands, that's the "master."