Quote:
Originally Posted by murraypaul
None of the current eReaders seem very good at navigating large numbers of files, so (assuming I stick with the stock reader rather than koReader), I would plan to sync combined eBooks, with entire series combined into a single book. That brings the number down to hundreds rather than thousands, but does mean that some of the books get very big, in the 10-30MB size and 20k-30k page count range. My old PRS-505 can handle these, so I can't imagine a modern reader would have a problem, but does anyone have experience with using very large books with Kobo readers.
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The key is not the size of the file but the size of the text files inside the file. Check out the Quality Check plugin for calibre. Under Check ePub Structure, try the Check oversize html files option. Sometimes a simple epub to epub conversion with calibre will fix these though I prefer using Sigil to split the files and do other cleanup. At times, I've merged books in a series and ended up with files larger than 50MB but as long as the html files are reasonable sized, I've haven't seen any issues. I also have multiple books that are in the 200-390MB range for a single book but these are cooking related books that are heavy in images.
I swapped the 8GB uSD card in my Clara HD for a 32GB uSD card and currently have ~9000 books on it. My main method of looking for books is search and I haven't seen much in the line of speed issues with that number of books.