i have a Nikon D3300 and i have a multitude of sd and micro sd cards and whenever i insert a micro sd card in an adapter a message appears on the screen saying "this memory card cannot be used. Card may be damaged. Insert another card" but the cards and adapters are real and work on my laptop and canon dslr.
Read more: Why wont my dslr acsept a micro SD card with an adaptor?