As far as I understand (and I'm not into Linux) /Data/ = the internal memory (IM) of the reader gets mounted/dismounted during startup. So it isn't 100% save to bind from IM.
OTOH also the gurus (kartu, boroda) suggest to bind huge (mainly asian) fonts direct from IM instead of copying them to /tmp/ (which might be a kind of ram-disk - but that hasn't to say much with only flash-memory in the device)
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