Quote:
Originally Posted by Katsunami
You must also watch out for the format of the card itself.
Cards bigger than 32GB are most often SDXC instead of SDHC, and this requires a different controller. Not all devices support SDXC cards. There are some 64GB SDHC cards, but that size is not officially supported for SDHC as far as I know; therefore it may not work with all SDHC controllers.
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As I mentioned earlier in this thread, AFAIK the difference between SDHC and SDXC are minimal and you should not need a different controller (unlike with SDSC vs SDHC). The only real difference is in the size since SDHC limits the field which defines size to a certain value whereas SDXC allows it to be larger, but the actual size of the field hasn't changed, it's just that the value is limited in SDHC. SDXC cards should also be formatted with ExFAT by default where as SDHC with FAT32, but there's nothing stopping the user formatting either with either barring OS limitations. There are additional speeds and capabilities which were first defined in the SDXC related specs, but AFAIK there's nothing stopping a SDHC card also having these speeds and capabilities, the intention is for backwards compatibility with them (although as always for a variety of reasons this may not work out). Note this doesn't mean that it's guaranteed a 64GB card will work in any SDHC device, there are various reasons it may not and we have a report of a FAT32 formatted 64GB card not working with the external slot of the Aura (but also with one working with an unknown slot).