On 32GB+ cards, we would need to format the file system as FAT32 with 32K cluster size for best all-round compatibility & avoid weird issues.
By default, I guess 64GB cards come with exFat, which creates problems with Android. On the new devices like SGS4 & using the new releases of Kitkat, exFAT doesn't appear to be an issue, however, for our humble Onyx's, running ICS, I believe it would be best to try for compatibility & remain on FAT 32.
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