Canon PIXMA MG4200 Series On-Screen Manual page 159

Important
Part of the memory card will protrude from the card slot, but do not force it into the slot any
further. This can damage the machine or the memory card.
Make sure that the memory card is correctly oriented before inserting it into the card slot. If you
force the memory card into the card slot in the wrong orientation, the memory card or the
machine can be damaged.
Do not insert more than one memory card at a time.
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