I have noticed that with some USB readers (not to mention other media devices, such as digital cameras) there seems to be an upper limit to the amount of internal storage they can support. When I insert low capacity micro sd cards (16GB or less) they work fine, however when I try 32GB or 64GB and the device cannot read the SD card. They are from different manufacturers, so I assume that this is the result of a more generic issue.
Question: Why aren’t some USB readers capable of supporting large capacity SD cards? Does it have to do with the computer architecture? It would be nice to know if there was a rhyme or reason to it all. Currently, it’s a bit of trial by fire; I'm never quite sure how to scale my memory due to the fact that I remain unsure whether it will be supported or not.