gk
I bought these microSDXC cards for use in my tablet, however, my tablet only recognizes FAT32 formatted cards and not the exFAT that these cards use. I had suspicions about this based upon other reviewers' experiences. Windows computers will not reformat in FAT32 beyond the 32 GB limit. I was able to locate a small program that would reformat a drive to FAT32 without the 32GB limitation (FAT32 can accommodate up to a 3 TB drive). I used the Windows GUI version of fat32format (freeware) and it quickly reformatted the memory card. Now the card works in my tablet.