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Ah.
The SD card is generally empty, as it's not required for the device to function... I think that, even if I restored my 770 to "factory fresh", the card itself would be empty. It's just a standard linux mount.
It does have a swap file (.swap), but swap is an option that you have to specifically turn on.
Internally, I believe it is always mapped to /media/mmc1 -- you might be able to access it that way, but I think the system software unmounts the card when it's accessed by USB.
Is it reasonable to add a Calibre-specific hidden file?
m a r
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