As I understand it, there is little, if any, electronic difference
between SDHC and SDXC cards, and even devices advertised as only
supporting cards up to 32GB have no problem reading larger cards that
are properly formatted.
What is an issue is that many cards 64GB and larger come preformatted
with Microsoft's proprietary xFAT filesystem, which has poor to
non-existent support outside of Windows and many devices advertised as
having a limit of 32GB don't know how to format larger cards. For
example, the 256GB card I have in my Blaze ET came from the factory
formatted xFAT, and the Blaze couldn't identify the card at all, and
the Blaze's own SD formatting utility still can't detect the card, but
it worked just fine after using my Desktop Linux PC to format it to
FAT32, and I went through the same experience with the 64GB card the
256GB card replaced.
Of course, you'll be formatting the microSD regardless(writing an
image will overwrite whatever is already on the card), so no need to
manually format the card to something the Pi can read.
That said, I've never actually tested a 64GB card with the Pi(the
aforementioned SDXC cards were full-sized and all my microSDs are 32GB
or smaller).
--
Sincerely,
Jeffery Wright
Bachelor of Computer Science
President Emeritus, Nu Nu Chapter, Phi Theta Kappa.
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