This is pretty much the fastest card I've ever seen, or so I thought. It also has a second set of contacts, which is something I had never seen in a card before! After having just opened the package, the PC had a hard time even recognizing the card. I mean, it didn't even show up as a device in the file browser. But after a few tries, it showed up as blank with exfat formatting. I then just ejected it and tried it on the quad again. No luck. The PC still had a hard time recognizing it.
So I got the PC to recognize the card again, after many tries. This time around, I reformatted the card (in exfat) even though it's supposed to have been preformatted. Now, the PC recognizes the card easily, and even the Linux side of it recognizes the card easily! Later today I'll see if the quad now recognizes the card.
This reminds me of one of my Samsung EVO cards. My P3A wouldn't recognize it even though it was supposedly formatted. So I reformatted it and it worked fine.