Everyone bidding on this needs to understand that if the sdcard its put into a device that isnt capable of reading 64Gig then it may not work. I put one in my psp and it works but only 32Gigs of space can be used. But they work great in most phones. I have one in my Galaxy S3 and have no problems. My buddy has one in his X4 and has no problems.
please test writing files to fill out the whole 64gb card, there are many counterfeits that say they're a high capacity card but in fact aren't. You can use a specific program that will fill the card or simply fill the card with whatever you have if there's an error before its full then its counterfeit. I'm telling you this to help because of someone gets it and it isn't 64g they can keep your card and your credits.