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That usually seems like it is the card tested by the person submitting the report. You can, in many cases, use the smaller sizes. There are some manufacturer’s cards that do not work well, usually that information gets discussed from time to time. Of course, some cards have not yet been tested with the results posted for consideration. https://fujifilm-x.com/en-us/support/compatibility/cameras/ Click on a camera and you will get a list of supported card sizes and for some cameras, a list of which manufacturer’s cards passed their testing.