I bought a Sandisk 64 GB micro SD card from Best Buy. Actually this is the second one I had to exchange the first one due to the same problem I'm having now. When the card is in the bird it acts as if it's recording but as soon as I install it in my card reader at home it ask me to initialize the card (format). Also the card will show up as only being 1MB vs 64 GB so even if I do format using ex fat it never goes back to its original size. I work in IT so I've triple checked everything also the card reader is ok so for the moment I have to use the card that came with the bird so I'm curious as to what brand and size you guys are using