Fwiw, I have a 64Mb memory stick in one slot and a 4Gb SDHC in the other slot of my 505 - both function perfectly OK, albeit it takes a little longer to boot up after I've loaded new books. I keep purchased books in the main memory, the SDHC card is the repository for the free books that came with the reader & the memory stick takes a couple of special collections. Only downside I've noticed is a reduction in battery life if I keep both cards in permanently.
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