I can't understand, why several kingston sd cards, which are micro-sd with adapter(sd), are not recognized from internal sd card slot of mbp (late '13), but they are visible and usable by osx system when I put them to usb card reader, which is attached to mbp. Why this happens? This way sd slot of mbp is almost useless. Is something about the adapters? All of them are 'kingston', but I have a 'sandisk' also, no difference at all. Slot does not malfunction with other 'normal'(not micro-sd with adapter) sd cards. Even my cheapest netbook recognizes these cards, but mbp does not. Any explanation? Why this happens?