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mini disc as in those square things that were a hit in asia? or those mini cd's for singles. i think that's what you're referring to. when you load your cd's into the magazine, if there is a inner circle kinda holder within the holder, then your mini cd will be safe.
i don't recall any small inner circles for the changer. i don't think any cartridge changers accept mini cd's because they'd be a lot harder to mount into the system