Always can trust SanDisk for my memory card needs.  This purchase was because I was considering getting a Samsung Galaxy S3 phone, which only has 16gb memory, but has an internal slot for memory expansion.  However, just had several bad experiences with 3 Samsung Printers at work ~ all of them broke down within a couple of weeks of each other for various reasons, and to get repair and replacement parts is ridiculously expensive.... cheaper for me to go and buy a new printer!  Samsung website is 1500% useless, and tech support is even less knowledgeable than my 4 year old nephew!  Spoke to a good friend who works for AT&T;, who has both S3 and iPhone 5.... and he said, DONT GET THE S3.... so I upgraded to an 64GB iPhone 5.So this memory card has gone to my son for his Galaxy S3.So sorry about the rant, but I hate Samsung.....