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You will have to write to the card via an external reader/writer connected to your pc first. Then once you have the files loaded onto the card you can plug the card into the Sansa, reboot rockbox, and then rockbox will be able to read the card just fine.
But maybe that's just the standard cards..?
we should be ok up to the sdhc max
which is 32GB as per Sandisks specification. Not that cards of that size are available already ...
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