My phone didn't see it at all when I put it in so I had to get my computer to format it. Somehow, even though I've been a computer tech for decades, I had issues getting the computer to mess with it. I found a program specifically for formatting SD cards and that worked just fine, only it took nine hours to accomplish it. No doubt that was my USB transfer rates but I really don't know. These are way more words than I intended to type but I type really fast and it's kind of nothing. lol I really just want to make a selfie video of my yelling, "I have a half a terabyte in my pocket!!!" because I literally now have 640 gigabytes of available data storage in my pocket and that is awesome.