For what it's worth... original 505 couldn't handle SDHC cards but when the ePub upgrade came out, it also included ability to read SDHC cards. I've had 600 on internal memory and managed at about 3.5K in card but if you want a portable library then the solution is use PRS+... set cards to noscan and then pour the books in (I use Folder/file construction with each author having a folder and folders organised into sub-alphas then alpha for ease of use). Now comfortably got nearly 25K books on 16GB SDHC card (takes 6.9GB of space so far) and just add books by drag'n'drop to memory card (or use calibre)
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