So I just bought a brand spanking new, $100, 64GB SDXC Class 10 card to replace my 32GB SDHC Class 10 after a tragic accident on Splash Mountain... This card is for my personal Panasonic AG-HMC-80. I pop in this new card thinking it's going to work right off the bat. I warm-up the black beast! (Girlfriends Nickname for my camera) As soon as the LCD lights up, it says check card. The read/write speed of this card and the last are exactly the same. What am I doing wrong? My camera writes at 24mb/s, the package on this card said 25mb/s so in theory it should work, considering the last card had the same speed, allegedly. Someone please tell me what I'm doing wrong...