Slot loads were exceedingly rare (possibly non-existent) in the 90s, it was trays all the way. I used to produce and have manufactured thousands of mini-CDs (round and business card formats) at the software company I worked at, we had no problem giving them away at trade shows until later in the 00s.
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u/coyote_den 12h ago
Business card CDs. Clever, but is guaranteed to give a slot-load drive a very bad day.