I have a Surface Pro 3 and just bought a 64GB Samsung Micro SD. The Surface doesn't seem to recognize the card! I've installed all the latest windows updates, tried restarting with Micro SD on but nothing seems to work! Any ideas on what I should do? Thanks!
If the card is working on other Windows systems, it's probably not a formatting problem. Try "jiggling" the card, sometimes they don't make a solid contact when initially inserted.