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Sealbeater (& Kartu)
I've now spent some time looking at the number of books and card memory usage availability. Note that I am using PRS+ with card scan disabled... this is to get quantity on the 505 without waiting for a lengthy rescan when adding new books.
Originally I put around 25K books on a 16GB SDHC (using about 6.5GB of the card)... all files and folders accessible (and visible) on computers (both PC and Mac). When installed into the 505 around 16K of files and folders visible and accessible, the rest of the folders showed no content. Checking showed around 16K files folders/4GB usable.
Cleared card and tried with 16GB & 8GB SDHC and 8GB MS... results the same on SDHC cards... at around 16K of files or 4GB of space used, nothing further is visible/accessible on the 505... so far 8GB MS OK but not yet approached 16K/4GB limits.
It looks like a limit of the Sony OS that either 16K of books or 4GB forms a limit for actual visibility/access but by using the SDHC and MS, I now have access to just under 25K of books with scanning disabled. It works fine... browse Files/Folders, click on book and move to internal memory to read. The real annoyance is, that it makes an ability to access 16GB SDHC cards, rather pointless...
As an aside concerning slowdown with lots of books, before using PRS+, I tried various things to see max I could get on a card and, even with 6.5K books on the card, had no slowdown in access/page turn etc... The slowdown came with restarting after adding new books, at this point up to 3 hours to scan and restart which was still usable by doing it overnight but not really comfortable as it would also take that time to restart after a crash... and the machine was definitely less stable with a lot on a scanned memory card (also solved by using PRS+ noscan). The real slowdown I experienced was with very large (several thousand pages) books, in particular PDFs. By the time I got toward the end of one 3K page PDF, page turns were taking 10-15 seconds.
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