sauer "D.S."
I love SanDisk, and I have used quite a few of their products, including an mp3 player, a couple of USB keys and even a micro SD card (class 4). I have never had any problems. After installing this card, however, I have seen it unmounting itself randomly to be detected again and automatically being mounted by my Galaxy S4 device. This happens several times a day, including when I am in the middle of watching a movie on the phone (this is the first week that I have had the card). This is unacceptable. Normally, I would have just asked for a replacement, but after doing some research online, I have found out that this seems to be a recurrent problem on many phone models and doesn't seem to be just "a dud", but a production issue. I have returned the card, and I am going to go with another brand instead.