I inserted this into my Galaxy Note, powered the phone on and went into storage. I pressed on 'mount sd card' it said it didn't understand the filesystem and asked if I wanted to format it. I did and then I saw 59 gigs of free space.Works great and got it for 43 bucks off Amazon.Con:It's extremely slow to write to. If I try to write a 3gb file from my PC to the card it takes about 26 minutes (2MB a sec). If I write to the internal SD card on my phone it writes at 10MB a sec. I don't understand why it's that slow. I can accept that it will be slower than an internal SD however I didn't know it would be dog slow. My 32GB samsung micro sd was much faster...