A:AnswerIf your device reads a 64 gb card it'll read a 256 gb card. It's like this, 2 gb and below is micro sd, 4 gb up to 32 gb is micro sdhc and 64 gb and above is micro sdxc. HC is high capacity and XC is extended capacity.
A:AnswerYes, it is fast enough to use as an extra storage device. I keep one in my laptop to switch files around devices and a 4-5GB video loads and offloads in about 5 minutes. Speed may be limited to my controllers, too.
A:AnswerWorks PERFECTLY on Samsung Galaxy S8+...that's what I have! You either did not insert the sd card properly...or you got a dud! To be fair, it is a little difficult to insert without Moving the SIM card that's already in there, as they are Both So Tiny! I would suggest opening your phone again to make sure Both cards are securely & flatly inserted & the correct side is facing up!
A:AnswerI think it handles large video and audio files better. It also records and plays those hi def. files smoothly. Your video and audio doesn't end up choppy.